diff --git a/.config/StartSch.run.xml b/.config/StartSch.run.xml
index b2b73e62..7d8ad232 100644
--- a/.config/StartSch.run.xml
+++ b/.config/StartSch.run.xml
@@ -1,5 +1,5 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="StartSch" type="LaunchSettings" factoryName=".NET Launch Settings Profile">
+  <configuration default="false" name="StartSch" type="LaunchSettings" factoryName=".NET Launch Settings Profile" activateToolWindowBeforeRun="false">
     <option name="LAUNCH_PROFILE_PROJECT_FILE_PATH" value="$PROJECT_DIR$/StartSch/StartSch.csproj" />
     <option name="LAUNCH_PROFILE_TFM" value="net10.0" />
     <option name="LAUNCH_PROFILE_NAME" value="http" />
diff --git a/StartSch/Components/Pages/CollaborationPage.razor b/StartSch/Components/Pages/CollaborationPage.razor
new file mode 100644
index 00000000..1ddc192a
--- /dev/null
+++ b/StartSch/Components/Pages/CollaborationPage.razor
@@ -0,0 +1,178 @@
+@attribute [Authorize]
+@page "/collaborations/{PageId:int}"
+
+@using StartSch.Services
+
+@rendermode InteractiveServerWithoutPrerendering
+@layout MainLayout
+@inherits ResourcePage<Page>
+
+@inject IDbContextFactory<Db> DbFactory
+@inject InterestService InterestService
+@inject AuthorizationService AuthorizationService
+
+@if (!IsResourceAvailable(_page, AuthorizationService.CanCreatePost, out var status))
+{
+    <ResourceUnavailable Status="@status"/>
+    return;
+}
+
+<main>
+    <article class="post">
+        <p class="display">
+            <h1>Oldal együttműködési kérelmei</h1>
+        </p>
+
+        @if (_items.Count == 0)
+        {
+            <p>Nincsenek együttműködési kérelmek.</p>
+        }
+        else
+        {
+            <ul class="collaboration-request-list"
+                style="list-style: none; padding: 0; display: flex; flex-direction: column; gap: 16px;">
+                @foreach (var request in _items)
+                {
+                    <li style="border: 1px solid #ccc; border-radius: 12px; padding: 16px;">
+                        @if (request is EventCollaborationRequest eventRequest)
+                        {
+                            <div style="font-weight: bold; margin-bottom: 8px;">
+                                Esemény együttműködés
+                            </div>
+                            <div>
+                                <a href="/events/@eventRequest.Event.Id">@eventRequest.Event.Title</a>
+                            </div>
+                            <div class="small text" style="margin-top: 4px;">
+                                Szervező: @(eventRequest.Event.Categories.FirstOrDefault()?.Page.Name ?? eventRequest.Event.Categories.FirstOrDefault()?.Page.PekName ?? "Ismeretlen")
+                            </div>
+                        }
+                        else if (request is PostCollaborationRequest postRequest)
+                        {
+                            <div style="font-weight: bold; margin-bottom: 8px;">
+                                Poszt együttműködés
+                            </div>
+                            <div>
+                                <a href="/posts/@postRequest.Post.Id">@postRequest.Post.Title</a>
+                            </div>
+                            <div class="small text" style="margin-top: 4px;">
+                                Szerző: @(postRequest.Post.Categories.FirstOrDefault()?.Page.Name ?? postRequest.Post.Categories.FirstOrDefault()?.Page.PekName ?? "Ismeretlen")
+                            </div>
+                        }
+
+                        <div style="display: flex; gap: 8px; margin-top: 12px">
+                            <button type="button" @onclick="() => Accept(request)" class="small filled round">
+                                Elfogadás
+                            </button>
+                            <button type="button" @onclick="() => Deny(request)"
+                                    class="small text round error standard">Elutasítás
+                            </button>
+                        </div>
+                    </li>
+                }
+            </ul>
+        }
+    </article>
+</main>
+
+@code {
+    private Page? _page;
+    private readonly List<CollaborationRequest> _items = [];
+    [Parameter] public int PageId { get; set; }
+
+    protected override async Task OnInitializedAsync()
+    {
+        await InterestService.LoadIndex;
+        await using var db = await DbFactory.CreateDbContextAsync();
+
+        _page = await db.Pages.FirstOrDefaultAsync(g => g.Id == PageId);
+        if (_page == null)
+            return;
+
+        _items.AddRange(await db.EventCollaborationRequests
+            .Include(r => r.Event)
+            .ThenInclude(e => e.Categories)
+            .ThenInclude(c => c.Page)
+            .Where(r => r.PageId == PageId)
+            .ToListAsync());
+
+        _items.AddRange(await db.PostCollaborationRequests
+            .Include(r => r.Post)
+            .ThenInclude(p => p.Categories)
+            .ThenInclude(c => c.Page)
+            .Where(r => r.PageId == PageId)
+            .ToListAsync());
+    }
+
+    private async Task Accept(CollaborationRequest request)
+    {
+        await using var db = await DbFactory.CreateDbContextAsync();
+
+        var page = await db.Pages
+            .Include(p => p.Categories)
+            .FirstOrDefaultAsync(p => p.Id == PageId);
+
+        if (page == null || page.Categories.Count == 0) return;
+        var category = page.Categories[0];
+
+        if (request is EventCollaborationRequest evInfo)
+        {
+            var ev = await db.Events
+                .Include(e => e.Categories)
+                .FirstOrDefaultAsync(e => e.Id == evInfo.EventId);
+
+            if (ev != null)
+            {
+                if (!ev.Categories.Any(c => c.Id == category.Id))
+                    ev.Categories.Add(category);
+
+                var toRemove = await db.EventCollaborationRequests
+                    .FirstOrDefaultAsync(r => r.Id == evInfo.Id);
+                if (toRemove != null)
+                    db.EventCollaborationRequests.Remove(toRemove);
+            }
+        }
+        else if (request is PostCollaborationRequest postInfo)
+        {
+            var post = await db.Posts
+                .Include(p => p.Categories)
+                .FirstOrDefaultAsync(p => p.Id == postInfo.PostId);
+
+            if (post != null)
+            {
+                if (!post.Categories.Any(c => c.Id == category.Id))
+                    post.Categories.Add(category);
+
+                var toRemove = await db.PostCollaborationRequests
+                    .FirstOrDefaultAsync(r => r.Id == postInfo.Id);
+                if (toRemove != null)
+                    db.PostCollaborationRequests.Remove(toRemove);
+            }
+        }
+
+        await db.SaveChangesAsync();
+        _items.Remove(request);
+    }
+
+    private async Task Deny(CollaborationRequest request)
+    {
+        await using var db = await DbFactory.CreateDbContextAsync();
+
+        if (request is EventCollaborationRequest evInfo)
+        {
+            var toRemove = await db.EventCollaborationRequests
+                .FirstOrDefaultAsync(r => r.Id == evInfo.Id);
+            if (toRemove != null)
+                db.EventCollaborationRequests.Remove(toRemove);
+        }
+        else if (request is PostCollaborationRequest postInfo)
+        {
+            var toRemove = await db.PostCollaborationRequests
+                .FirstOrDefaultAsync(r => r.Id == postInfo.Id);
+            if (toRemove != null)
+                db.PostCollaborationRequests.Remove(toRemove);
+        }
+
+        await db.SaveChangesAsync();
+        _items.Remove(request);
+    }
+}
diff --git a/StartSch/Components/Pages/EventEditPage.razor b/StartSch/Components/Pages/EventEditPage.razor
index 5b7df930..15562dca 100644
--- a/StartSch/Components/Pages/EventEditPage.razor
+++ b/StartSch/Components/Pages/EventEditPage.razor
@@ -12,6 +12,7 @@
 @inject NavigationManager Navigation
 @inject IServiceProvider ServiceProvider
 @inject AuthorizationService AuthorizationService
+@inject InterestService InterestService
 
 @if (!IsResourceAvailable(
          _event,
@@ -61,6 +62,79 @@
                 </label>
             </div>
 
+            <div>
+                <div style="display: flex; gap: 16px; margin-top: 16px;">
+                    <div style="flex: 1;">
+                        <div class="small filled round">
+                            Kiválasztott kollaboráló körök
+                        </div>
+
+                        @if (_model.CollaborationCategories.Count > 0)
+                        {
+                            <div style="margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px;">
+                                @foreach (var category in _model.CollaborationCategories)
+                                {
+                                    <div
+                                        style="display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border: 1px solid #ccc; border-radius: 12px;">
+                                        <span>@(category.Name ?? category.Page.Name ?? category.Page.PekName)</span>
+                                        <button type="button" @onclick="() => RemoveCollaborationCategory(category)">×
+                                        </button>
+                                    </div>
+                                }
+                            </div>
+                        }
+
+                        <div style="margin-top: 16px;">
+                            <span>Kollaboráló kör</span>
+                            <InputSelect TValue="int?" @bind-Value="@SelectedCollaborationCategoryId">
+                                <option value=""></option>
+                                @foreach (var e in _administeredCategories.Where(c => !_model.CollaborationCategories.Contains(c)).Distinct())
+                                {
+                                    <option value="@e.Id">
+                                        @(e.Name ?? e.Page.Name ?? e.Page.PekName)
+                                    </option>
+                                }
+                            </InputSelect>
+                        </div>
+                    </div>
+                    <div style="flex: 1;">
+                        <div class="small filled round">
+                            Kiválasztott kollaborálónak meghívható körök
+                        </div>
+
+                        @if (_model.PossibleCollaborationPages.Count > 0)
+                        {
+                            <div style="margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px;">
+                                @foreach (var page in _model.PossibleCollaborationPages)
+                                {
+                                    <div
+                                        style="display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border: 1px solid #ccc; border-radius: 12px;">
+                                        <span>@(page.Name ?? page.Name ?? page.PekName)</span>
+                                        <button type="button" @onclick="() => RemovePossibleCollaborationPage(page)">×
+                                        </button>
+                                    </div>
+                                }
+                            </div>
+                        }
+                        <div style="margin-top: 16px;">
+                            <span>Kollaborálónak meghívható kör</span>
+                            <InputSelect TValue="int?" @bind-Value="@SelectedPossibleCollaborationPageId">
+                                <option value=""></option>
+                                @foreach (var e in _possibleCollaborationPages)
+                                {
+                                    @if (e.Name != null || e.PekName != null)
+                                    {
+                                        <option value="@e.Id">
+                                            @(e.Name ?? e.PekName)
+                                        </option>
+                                    }
+                                }
+                            </InputSelect>
+                        </div>
+                    </div>
+                </div>
+            </div>
+
             <div style="margin-top: 8px">
                 <label>
                     <span style="display: block">
@@ -100,7 +174,8 @@
                 @if (EventId != 0)
                 {
                     <div style="flex: 1"></div>
-                    <expressive-button href="@($"/events/{_event.Id}/delete")" class="small text round error standard" disabled="@_isBusy">
+                    <expressive-button href="@($"/events/{_event.Id}/delete")" class="small text round error standard"
+                                       disabled="@_isBusy">
                         <md-icon slot="icon">delete</md-icon>
                         Törlés
                     </expressive-button>
@@ -108,7 +183,7 @@
             </div>
         </EditForm>
     </Form>
-   
+
     <Previews>
         @{
             _event.Start = _model.Start?.ToLocalDateTime().InZoneLeniently(Utils.HungarianTimeZone).ToInstant();
@@ -126,7 +201,10 @@
     private readonly List<Event> _possibleParents = [];
     private readonly EventEditModel _model = new();
     private bool _isBusy;
-
+    private int? _selectedCollaborationCategoryId;
+    private List<Page>? _administeredPages;
+    private readonly List<Category> _administeredCategories = [];
+    private List<Page> _possibleCollaborationPages = [];
     [Parameter] public int EventId { get; set; }
 
     [SupplyParameterFromQuery(Name = "categories")]
@@ -139,6 +217,13 @@
     {
         await using var db = await DbFactory.CreateDbContextAsync();
 
+        var index = await InterestService.LoadIndex;
+        _administeredPages = index.GetPages(AuthorizationService.AdministeredPageIds);
+        if (_administeredPages != null)
+        {
+            _administeredPages.ForEach(p => { _administeredCategories.AddRange(p.Categories); });
+        }
+
         if (EventId == 0) // new event
         {
             Event? parent = ParentId.HasValue
@@ -170,6 +255,11 @@
                 .ToListAsync();
             newEvent.Categories.AddRange(categories);
 
+            var administeredPageIds = _administeredPages?.Select(p => p.Id).ToList() ?? [];
+            _possibleCollaborationPages = await db.Pages
+                .Where(p => !administeredPageIds.Contains(p.Id))
+                .ToListAsync();
+
             _event = newEvent;
         }
         else // editing
@@ -181,8 +271,15 @@
                 .FirstOrDefaultAsync(e => e.Id == EventId);
             if (_event == null)
                 return;
+
+            _model.CollaborationCategories = _event.Categories.ToList();
+            _model.PossibleCollaborationPages = await db.EventCollaborationRequests
+                .Where(r => r.EventId == _event.Id)
+                .Select(r => r.Page)
+                .ToListAsync();
         }
 
+
         _model.Start = (_event.Start ?? SystemClock.Instance.GetCurrentInstant())
             .InZone(Utils.HungarianTimeZone)
             .ToDateTimeUnspecified();
@@ -192,6 +289,7 @@
                      ?? _model.Start;
         _model.Title = _event.Title;
         _model.DescriptionMarkdown = _event.DescriptionMarkdown;
+
         if (_event.Parent != null)
         {
             _possibleParents.Add(_event.Parent);
@@ -210,7 +308,8 @@
         Event savedEvent = await eventService.Save(
             EventId,
             _event!.ParentId,
-            _event.Categories.Select(e => e.Id).ToHashSet(),
+            _event.Categories.Select(e => e.Id).Union(_model.CollaborationCategories.Select(e => e.Id)).ToHashSet(),
+            _model.PossibleCollaborationPages.Select(p => p.Id).ToHashSet(),
             _model.Title,
             _model.DescriptionMarkdown,
             _model.Start?.ToLocalDateTime().InZoneLeniently(Utils.HungarianTimeZone).ToInstant(),
@@ -220,6 +319,57 @@
         Navigation.NavigateTo($"/events/{savedEvent.Id}");
     }
 
+    private int? SelectedCollaborationCategoryId
+    {
+        get => _selectedCollaborationCategoryId;
+        set
+        {
+            _selectedCollaborationCategoryId = value;
+            if (value.HasValue)
+            {
+                var category = _administeredCategories.FirstOrDefault(c => c.Id == value.Value);
+                if (category != null)
+                {
+                    if (!_model.CollaborationCategories.Contains(category))
+                        _model.CollaborationCategories.Add(category);
+                }
+
+                _selectedCollaborationCategoryId = null;
+            }
+        }
+    }
+
+    private void RemoveCollaborationCategory(Category category)
+    {
+        _model.CollaborationCategories.Remove(category);
+    }
+
+    private int? SelectedPossibleCollaborationPageId
+    {
+        get => _selectedCollaborationCategoryId;
+        set
+        {
+            _selectedCollaborationCategoryId = value;
+            if (value.HasValue)
+            {
+                var page = _possibleCollaborationPages.FirstOrDefault(p => p.Id == value.Value);
+                if (page != null)
+                {
+                    if (!_model.PossibleCollaborationPages.Contains(page))
+                        _model.PossibleCollaborationPages.Add(page);
+                }
+
+                _selectedCollaborationCategoryId = null;
+            }
+        }
+    }
+
+    private void RemovePossibleCollaborationPage(Page page)
+    {
+        _model.PossibleCollaborationPages.Remove(page);
+    }
+
+
     private class EventEditModel
     {
         public DateTime? Start
@@ -235,6 +385,8 @@
 
         public DateTime? End { get; set; }
         public int? ParentId { get; set; }
+        public List<Category> CollaborationCategories { get; set; } = [];
+        public List<Page> PossibleCollaborationPages { get; set; } = [];
         [Length(1, 100)] public string Title { get; set; } = "";
         [MaxLength(20000)] public string? DescriptionMarkdown { get; set; }
 
diff --git a/StartSch/Components/Pages/EventPage.razor b/StartSch/Components/Pages/EventPage.razor
index c2a72c2c..32b0beb7 100644
--- a/StartSch/Components/Pages/EventPage.razor
+++ b/StartSch/Components/Pages/EventPage.razor
@@ -1,59 +1,61 @@
 @page "/events/{EventId:int}"
 
 @using System.Data
+@using NodaTime.Text
 @using StartSch.Services
 
-@layout MainLayout
 @inherits ResourcePage<Event>
 
 @inject Db Db
 @inject InterestService InterestService
 @inject AuthorizationService AuthorizationService
 
-@if (!IsResourceAvailable(_event, AuthorizationService.CanRead, out var status))
+@if (After != null)
 {
-    <ResourceUnavailable Status="@status"/>
+    @if (_event != null)
+    {
+        <InfiniteList TItem="@Event"
+                      FetchPage="FetchPage"
+                      GetCursor="GetCursor"
+                      BaseUrl="@($"/events/{EventId}")"
+                      After="@After"
+                      PageSize="30">
+            <ItemTemplate>
+                <EventPreviewTree Event="@context" ParentKnown="@true"/>
+            </ItemTemplate>
+        </InfiniteList>
+    }
 }
 else
 {
-    <PageTitle>@_event.Title</PageTitle>
-
-    <main>
-        <EventView Event="@_event"/>
-
-        <hr>
-
-        <div style="margin-top: 16px">
-            @foreach (object o in _event.Children
-                 .Concat<object>(_event.Posts)
-                 .OrderByDescending(o => o switch
-                 {
-                     Event e => e.Start,
-                     Post p => p.Created,
-                     _ => throw new InvalidOperationException()
-                 })
-            )
-            {
-                var key = o switch
-                {
-                    Event e => e.Id,
-                    Post p => int.MaxValue - p.Id,
-                    _ => throw new InvalidOperationException()
-                };
-                <div @key="@key">
-                    @switch (o)
-                    {
-                        case Event e:
-                            <EventPreviewTree Event="@e" ParentKnown="@true"/>
-                            break;
-                        case Post p:
-                            <PostPreview Post="@p" EventKnown="@true"/>
-                            break;
-                    }
+    <LayoutView Layout="@typeof(MainLayout)">
+        @if (!IsResourceAvailable(_event, AuthorizationService.CanRead, out var status))
+        {
+            <ResourceUnavailable Status="@status"/>
+        }
+        else
+        {
+            <PageTitle>@_event.Title</PageTitle>
+
+            <main>
+                <EventView Event="@_event"/>
+
+                <hr>
+
+                <div style="margin-top: 16px">
+                    <InfiniteList TItem="@Event"
+                                  FetchPage="FetchPage"
+                                  GetCursor="GetCursor"
+                                  BaseUrl="@($"/events/{EventId}")"
+                                  PageSize="30">
+                        <ItemTemplate>
+                            <EventPreviewTree Event="@context" ParentKnown="@true"/>
+                        </ItemTemplate>
+                    </InfiniteList>
                 </div>
-            }
-        </div>
-    </main>
+            </main>
+        }
+    </LayoutView>
 }
 
 @code {
@@ -61,10 +63,13 @@ else
 
     [Parameter] public int EventId { get; set; }
 
+    [Parameter, SupplyParameterFromQuery(Name = "after")]
+    public string? After { get; set; }
+
     protected override async Task OnInitializedAsync()
     {
         await InterestService.LoadIndex;
-        
+
         await using var tx = await Db.BeginTransaction(IsolationLevel.Snapshot);
 
         _event = await Db.Events
@@ -94,4 +99,34 @@ else
         await tx.CommitAsync();
     }
 
+    private async Task<List<Event>> FetchPage(string? after)
+    {
+        await InterestService.LoadIndex;
+
+        await using var tx = await Db.BeginTransaction(IsolationLevel.Snapshot);
+
+        IQueryable<Event> eventQueryable = Db.Events
+            .OrderByDescending(p => p.Start)
+            .ThenByDescending(p => p.Id);
+        if (After != null)
+        {
+            int comma = After.IndexOf(',');
+            Instant date = InstantPattern.ExtendedIso.Parse(After[..comma]).Value;
+            int postId = int.Parse(After.AsSpan(comma + 1));
+            eventQueryable = eventQueryable.Where(p => p.Start < date || (p.Start == date && p.Id < postId));
+        }
+        var events = await eventQueryable
+            .Take(30)
+            .Include(o => o.EventCategories)
+            .Include(p => p.Posts)
+            .AsSplitQuery()
+            .ToListAsync();
+        await tx.CommitAsync();
+
+        return events;
+    }
+
+    private string GetCursor(Event item) => $"{InstantPattern.ExtendedIso.Format(item.Start!.Value)},{item.Id}";
+    
+
 }
diff --git a/StartSch/Components/Pages/Home.razor b/StartSch/Components/Pages/Home.razor
index 8705bea7..b2dafaa4 100644
--- a/StartSch/Components/Pages/Home.razor
+++ b/StartSch/Components/Pages/Home.razor
@@ -2,22 +2,15 @@
 @using System.Data
 @using NodaTime.Text
 @using StartSch.Services
+
 @inject Db Db
 @inject InterestService InterestService
 
 <HeadContent>
-    <meta name="google-site-verification" content="14Mgk8m9qK6N3BYa9q22pXnNTXUAEybE28oEZQJJ5t4" />
+    <meta name="google-site-verification" content="14Mgk8m9qK6N3BYa9q22pXnNTXUAEybE28oEZQJJ5t4"/>
 </HeadContent>
 
 @{
-    bool hasMore = _posts is { Count: 30 };
-    string? nextLink = null;
-    if (_posts is { Count: > 0 })
-    {
-        Post lastPost = _posts[^1];
-        nextLink = $"/?after={InstantPattern.ExtendedIso.Format(lastPost.Published!.Value)},{lastPost.Id}";
-    }
-
     Instant currentInstant = SystemClock.Instance.GetCurrentInstant();
 }
 
@@ -25,9 +18,13 @@
 {
     @if (_posts != null)
     {
-        <InfiniteList Items="@_posts" HasMore="@hasMore" NextLink="@nextLink">
-            <ItemTemplate Context="post">
-                <PostPreview Post="post"/>
+        <InfiniteList TItem="@Post"
+                      FetchPage="FetchPostPage"
+                      GetCursor="GetPostCursor"
+                      BaseUrl="/"
+                      After="@After">
+            <ItemTemplate>
+                <PostPreview Post="context"/>
             </ItemTemplate>
         </InfiniteList>
     }
@@ -90,7 +87,7 @@ else
                             foreach (var opening in _openings)
                             {
                                 var page = opening.Categories[0].Page;
-                                
+
                                 <article>
                                     <div class="title">
                                         <h3 style="display: inline">
@@ -99,7 +96,7 @@ else
                                             </a>
                                         </h3>
 
-                                        <AdminButtonsForEvent Event="@opening" />
+                                        <AdminButtonsForEvent Event="@opening"/>
                                     </div>
 
                                     <div style="display: flex; align-items: center; flex-wrap: wrap; gap: 8px">
@@ -108,11 +105,11 @@ else
                                         <span class="date-display">
                                             <DateDisplay Date="@opening.Start"/>
                                         </span>
-                                        
+
                                         @{
                                             var orderable = opening is { OutOfStock: null }
-                                                            && opening.OrderingStart <= currentInstant
-                                                            && opening.OrderingEnd >= currentInstant;
+                                                                && opening.OrderingStart <= currentInstant
+                                                                && opening.OrderingEnd >= currentInstant;
                                         }
 
                                         <md-icon-button
@@ -166,9 +163,12 @@ else
 
                     @if (_posts != null)
                     {
-                        <InfiniteList Items="@_posts" HasMore="@hasMore" NextLink="@nextLink">
-                            <ItemTemplate Context="post">
-                                <PostPreview Post="post"/>
+                        <InfiniteList TItem="@Post"
+                                      FetchPage="FetchPostPage"
+                                      GetCursor="GetPostCursor"
+                                      BaseUrl="/">
+                            <ItemTemplate>
+                                <PostPreview Post="context"/>
                             </ItemTemplate>
                         </InfiniteList>
                     }
@@ -197,7 +197,6 @@ else
     protected override async Task OnInitializedAsync()
     {
         Instant currentInstant = SystemClock.Instance.GetCurrentInstant();
-        
         await InterestService.LoadIndex;
 
         await using var tx = await Db.BeginTransaction(IsolationLevel.Snapshot);
@@ -211,24 +210,35 @@ else
                 .ToListAsync();
         }
 
+        _posts = await FetchPostPage(After);
+        await tx.CommitAsync();
+    }
+
+    private async Task<List<Post>> FetchPostPage(string? after)
+    {
+        Instant currentInstant = SystemClock.Instance.GetCurrentInstant();
         IQueryable<Post> postsQuery = Db.Posts
             .WhereAnyoneCanRead(currentInstant)
             .OrderByDescending(p => p.Published)
             .ThenByDescending(p => p.Id);
-        if (After != null)
+
+        if (after != null)
         {
-            int comma = After.IndexOf(',');
-            Instant date = InstantPattern.ExtendedIso.Parse(After[..comma]).Value;
-            int postId = int.Parse(After.AsSpan(comma + 1));
+            int comma = after.IndexOf(',');
+            Instant date = InstantPattern.ExtendedIso.Parse(after[..comma]).Value;
+            int postId = int.Parse(after.AsSpan(comma + 1));
             postsQuery = postsQuery.Where(p => p.Published < date || (p.Published == date && p.Id < postId));
         }
-        _posts = await postsQuery
+
+        return await postsQuery
             .Take(30)
             .Include(o => o.PostCategories)
             .Include(p => p.Event)
             .AsSplitQuery()
             .ToListAsync();
-        await tx.CommitAsync();
     }
 
+    private string GetPostCursor(Post post) =>
+        $"{InstantPattern.ExtendedIso.Format(post.Published!.Value)},{post.Id}";
+
 }
diff --git a/StartSch/Components/Pages/OpeningHistoryPage.razor b/StartSch/Components/Pages/OpeningHistoryPage.razor
index 1f13038d..dc623b2b 100644
--- a/StartSch/Components/Pages/OpeningHistoryPage.razor
+++ b/StartSch/Components/Pages/OpeningHistoryPage.razor
@@ -1,32 +1,65 @@
 @page "/openings"
 
+@using NodaTime.Text
 @using StartSch.Services
 
-@layout MainLayout
-
 @inject Db Db
 @inject InterestService InterestService
 
-<h1>Nyitások</h1>
-
-@foreach (var opening in _openings)
+@if (After != null)
+{
+    <InfiniteList TItem="PincerOpening"
+                  FetchPage="FetchPage"
+                  GetCursor="GetCursor"
+                  BaseUrl="/openings"
+                  After="@After"
+                  PageSize="30">
+        <ItemTemplate>
+            <EventPreview Event="context"/>
+        </ItemTemplate>
+    </InfiniteList>
+}
+else
 {
-    <article style="margin-bottom: 32px">
-        <EventPreview Event="@opening"/>
-    </article>
+    <LayoutView Layout="@typeof(MainLayout)">
+        <h1>Nyitások</h1>
+        <InfiniteList TItem="PincerOpening"
+                      FetchPage="FetchPage"
+                      GetCursor="GetCursor"
+                      BaseUrl="/openings"
+                      PageSize="30">
+            <ItemTemplate>
+                <EventPreview Event="context"/>
+            </ItemTemplate>
+        </InfiniteList>
+    </LayoutView>
 }
 
 @code {
-    private List<PincerOpening> _openings = [];
+    [Parameter, SupplyParameterFromQuery(Name = "after")]
+    public string? After { get; set; }
 
-    protected override async Task OnInitializedAsync()
+    private async Task<List<PincerOpening>> FetchPage(string? after)
     {
         await InterestService.LoadIndex;
-        _openings = await Db.PincerOpenings
+
+        IQueryable<PincerOpening> query = Db.PincerOpenings
             .Where(o => o.End != null)
             .OrderByDescending(o => o.Start)
-            .Include(o => o.EventCategories)
-            .ToListAsync();
+            .ThenByDescending(o => o.Id)
+            .Include(o => o.EventCategories);
+
+        if (after != null)
+        {
+            int comma = after.IndexOf(',');
+            Instant afterInstant = InstantPattern.ExtendedIso.Parse(after[..comma]).GetValueOrThrow();
+            int afterId = int.Parse(after.AsSpan(comma + 1));
+            query = query.Where(o => o.Start < afterInstant || (o.Start == afterInstant && o.Id < afterId));
+        }
+
+        return await query.Take(30).ToListAsync();
     }
 
+    private string GetCursor(PincerOpening opening) =>
+        $"{InstantPattern.ExtendedIso.Format(opening.Start!.Value)},{opening.Id}";
 }
diff --git a/StartSch/Components/Pages/PagePage.razor b/StartSch/Components/Pages/PagePage.razor
index c1f3146e..1f62bd44 100644
--- a/StartSch/Components/Pages/PagePage.razor
+++ b/StartSch/Components/Pages/PagePage.razor
@@ -1,174 +1,241 @@
 @page "/pages/{PageId:int}"
 
+@using System.Data
+@using System.Text.Json
+@using NodaTime.Text
 @using StartSch.Services
 
-@layout MainLayout
 @inherits ResourcePage<Page>
 
 @inject Db Db
 @inject InterestService InterestService
 @inject AuthorizationService AuthorizationService
 
-@if (!IsResourceAvailable(_page, AuthorizationService.CanRead, out var status))
+@if (After != null)
 {
-    <ResourceUnavailable Status="@status"/>
-    return;
+    <InfiniteList TItem="object"
+                  FetchPage="FetchPage"
+                  GetCursor="GetCursor"
+                  BaseUrl="@($"/pages/{PageId}")"
+                  After="@After"
+                  PageSize="30">
+        <ItemTemplate>
+            @switch (context)
+            {
+                case Post post:
+                    <PostPreview Post="@post" KnownPageId="@PageId"/>
+                    break;
+                case Event e:
+                    <EventPreviewTree Event="@e" KnownPageId="@PageId"/>
+                    break;
+            }
+        </ItemTemplate>
+    </InfiniteList>
 }
-
-<main>
-    <article class="post">
-        <header class="display">
-            <Title>@(_page.GetName())</Title>
-        </header>
-
-        <page-interests page="@_page.Id">
-            <ul class="label-list">
-                @if (_page.PekId.HasValue)
-                {
-                    <li class="label">
-                        <md-icon>account_circle</md-icon>
-                        <a href="https://pek.sch.bme.hu/groups/@_page.PekId">
-                            PéK 
-                            <span style="color: var(--md-sys-color-outline); font-weight: 400">/</span>
-                            @(_page.PekName ?? _page.PekId.ToString())
-                        </a>
-                    </li>
-                }
-
-                @if (_page.PincerId.HasValue)
-                {
-                    <li class="label">
-                        <md-icon>restaurant</md-icon>
-                        <a href="https://schpincer.sch.bme.hu/provider/@_page.PincerId">
-                            SCH-Pincér
-                            <span style="color: var(--md-sys-color-outline); font-weight: 400">/</span>
-                            @(_page.PincerName ?? _page.PincerId.ToString())
-                        </a>
-                    </li>
-                }
-
-                @if (_page.ExternalUrl is { } url)
-                {
-                    <li class="label">
-                        <md-icon>link_2</md-icon>
-                        <a href="@url">
-                            @url.TryRemoveFromStart("https://").ToString()
-                        </a>
-                    </li>
-                }
-            </ul>
-        </page-interests>
-
-        @{
-            var canCreateEvent = AuthorizationService.CanCreateEvent(_page);
-            var canCreatePost = AuthorizationService.CanCreatePost(_page);
-        }
-        @if (canCreateEvent || canCreatePost)
+else
+{
+    <LayoutView Layout="@typeof(MainLayout)">
+        @if (!IsResourceAvailable(_page, AuthorizationService.CanRead, out var status))
         {
-            <div style="margin-top: 16px; display: flex; gap: 8px">
-                @{
-                    var defaultCategory = _page.Categories.Single(c => c.Name == null);
-                }
-                @if (canCreateEvent)
-                {
-                    <expressive-button href="@($"/events/0/edit?categories={defaultCategory.Id}")" class="small filled round">
-                        <md-icon slot="icon">calendar_add_on</md-icon>
-                        <span>
-                            Új esemény
-                        </span>
-                    </expressive-button>
-                }
-                @if (canCreatePost)
-                {
-                    <expressive-button href="@($"/posts/0/edit?categories={defaultCategory.Id}")" class="small tonal round">
-                        <md-icon slot="icon">chat_add_on</md-icon>
-                        Új poszt
-                    </expressive-button>
-                }
-            </div>
+            <ResourceUnavailable Status="@status"/>
+            return;
         }
-    </article>
 
-    <hr>
+        <main>
+            <article class="post">
+                <header class="display">
+                    <Title>@(_page.GetName())</Title>
+                </header>
+
+                <page-interests page="@_page.Id">
+                    <ul class="label-list">
+                        @if (_page.PekId.HasValue)
+                        {
+                            <li class="label">
+                                <md-icon>account_circle</md-icon>
+                                <a href="https://pek.sch.bme.hu/groups/@_page.PekId">
+                                    PéK
+                                    <span style="color: var(--md-sys-color-outline); font-weight: 400">/</span>
+                                    @(_page.PekName ?? _page.PekId.ToString())
+                                </a>
+                            </li>
+                        }
+
+                        @if (_page.PincerId.HasValue)
+                        {
+                            <li class="label">
+                                <md-icon>restaurant</md-icon>
+                                <a href="https://schpincer.sch.bme.hu/provider/@_page.PincerId">
+                                    SCH-Pincér
+                                    <span style="color: var(--md-sys-color-outline); font-weight: 400">/</span>
+                                    @(_page.PincerName ?? _page.PincerId.ToString())
+                                </a>
+                            </li>
+                        }
+
+                        @if (_page.ExternalUrl is { } url)
+                        {
+                            <li class="label">
+                                <md-icon>link_2</md-icon>
+                                <a href="@url">
+                                    @url.TryRemoveFromStart("https://").ToString()
+                                </a>
+                            </li>
+                        }
+                    </ul>
+                </page-interests>
 
-    <section>
-        <h2>Történet</h2>
-        @foreach (object item in _items)
-        {
-            <div @key="@GetKey(item)">
-                @switch (item)
+                @{
+                    var canCreateEvent = AuthorizationService.CanCreateEvent(_page);
+                    var canCreatePost = AuthorizationService.CanCreatePost(_page);
+                    // TODO what role should be required to accept collaboration requests ASK ALBI
+                    var canAcceptCollaborationRequests = canCreatePost && canCreateEvent;
+                }
+                @if (canCreateEvent || canCreatePost || canAcceptCollaborationRequests)
                 {
-                    case Post post:
-                        <PostPreview Post="@post" KnownPageId="@PageId"/>
-                        break;
-                    case Event e:
-                        <EventPreviewTree Event="@e" KnownPageId="@PageId"/>
-                        break;
+                    <div style="margin-top: 16px; display: flex; gap: 8px">
+                        @{
+                            var defaultCategory = _page.Categories.Single(c => c.Name == null);
+                        }
+                        @if (canCreateEvent)
+                        {
+                            <expressive-button href="@($"/events/0/edit?categories={defaultCategory.Id}")"
+                                               class="small filled round">
+                                <md-icon slot="icon">calendar_add_on</md-icon>
+                                <span>
+                                    Új esemény
+                                </span>
+                            </expressive-button>
+                        }
+                        @if (canCreatePost)
+                        {
+                            <expressive-button href="@($"/posts/0/edit?categories={defaultCategory.Id}")"
+                                               class="small tonal round">
+                                <md-icon slot="icon">chat_add_on</md-icon>
+                                Új poszt
+                            </expressive-button>
+                        }
+                        @if (canAcceptCollaborationRequests)
+                        {
+                            <expressive-button href="@($"/collaborations/{PageId}")" class="small text round">
+                                <md-icon slot="icon">chat_info</md-icon>
+                                Kollaborációs kérelmek
+                            </expressive-button>
+                        }
+                    </div>
                 }
-            </div>
-        }
-    </section>
-</main>
+            </article>
+
+            <hr>
+
+            <section>
+                <h2>Történet</h2>
+                <InfiniteList TItem="object"
+                              FetchPage="FetchPage"
+                              GetCursor="GetCursor"
+                              BaseUrl="@($"/pages/{PageId}")"
+                              PageSize="30">
+                    <ItemTemplate>
+                        @switch (context)
+                        {
+                            case Post post:
+                                <PostPreview Post="@post" KnownPageId="@PageId"/>
+                                break;
+                            case Event e:
+                                <EventPreviewTree Event="@e" KnownPageId="@PageId"/>
+                                break;
+                        }
+                    </ItemTemplate>
+                </InfiniteList>
+            </section>
+        </main>
+    </LayoutView>
+}
 
 @code {
     private Page? _page;
-    private readonly List<object> _items = [];
     private readonly Instant currentInstant = SystemClock.Instance.GetCurrentInstant();
+
     [Parameter] public int PageId { get; set; }
 
+    [Parameter, SupplyParameterFromQuery(Name = "after")]
+    public string? After { get; set; }
+
     protected override async Task OnInitializedAsync()
     {
         await InterestService.LoadIndex;
 
         _page = await Db.Pages.FirstOrDefaultAsync(g => g.Id == PageId);
-        if (_page == null)
-            return;
+    }
 
-        var postsAndEvents = await Db
-            .SelectPostsAndEventsInCategories(
-                CategoryUtils
-                    .FlattenIncludedCategories(_page.Categories)
-                    .Select(c => c.Id)
-            )
-            .OrderByDescending(x => x.Date)
-            .ToListAsync();
-
-        var postIds = postsAndEvents.Where(x => x.PostId != 0).Select(x => x.PostId);
-        var eventIds = postsAndEvents.Where(x => x.EventId != 0).Select(x => x.EventId);
-
-        var posts = await Db.Posts
-            .WhereUserCanRead(currentInstant, AuthorizationService)
-            .Include(p => p.PostCategories)
-            .Where(p => postIds.Contains(p.Id))
-            .Include(p => p.Event)
-            .OrderBy(p => p.Published.HasValue) // drafts first
-            .ThenByDescending(p => p.Published)
-            .ThenByDescending(p => p.Created) // order drafts
-            .ToListAsync();
+    private async Task<List<object>> FetchPage(string? after)
+    {
+        await InterestService.LoadIndex;
 
-        var events = await Db.Events
-            .Where(e => eventIds.Contains(e.Id))
+        await using var tx = await Db.BeginTransaction(IsolationLevel.Snapshot);
+
+        IQueryable<Post> posts = Db.Posts
+            .WhereAnyoneCanRead(currentInstant)
+            .Where(p => p.Categories.Any(c => c.PageId == PageId))
+            .Include(p => p.Categories)
+            .Include(p => p.Event)
+            .OrderByDescending(p => p.Published ?? p.Created);
+        
+        IQueryable<Event> events = Db.Events
+            .Where(e => e.Categories.Any(c => c.PageId == PageId))
             .Include(e => e.EventCategories)
-            .OrderByDescending(e => e.Start)
-            .ToListAsync();
+            .Include(e => e.Posts)
+            .OrderByDescending(e => e.Start ?? e.Created);
+        
+        IQueryable<object> query = posts.Concat<object>(events)
+            .OrderByDescending(o => GetDate(o));
+
+        List<object> pageItems = [];
+        
+        if (after != null)
+        {
+            int comma = after.IndexOf(',');
+            Instant afterInstant = InstantPattern.ExtendedIso.Parse(after[..comma]).GetValueOrThrow();
+            int afterId = int.Parse(after.AsSpan(comma + 1));
+            posts = posts.Where(p => 
+                (p.Published ?? p.Created) < afterInstant || 
+                ((p.Published ?? p.Created) == afterInstant && p.Id < afterId));
+            events = events.Where(e => 
+                (e.Start ?? e.Created) < afterInstant || 
+                ((e.Start ?? e.Created) == afterInstant && e.Id < afterId));
+            // baseQuery = baseQuery.Where(r => r.ObjDate < afterInstant || (r.ObjDate == afterInstant && r.Id < afterId));
+        }
+        
+        pageItems.AddRange(await posts.Take(30).ToListAsync());
+        pageItems.AddRange(await events.Take(30).ToListAsync());
+        pageItems = pageItems
+            .OrderByDescending(o => GetDate(o))
+            .Take(30)
+            .ToList();
 
-        _items.AddRange(posts.Where(p => p.Event == null));
-        _items.AddRange(events.Where(e => e.Parent == null));
+        await tx.CommitAsync();
 
-        _items.Sort((a, b) => GetDate(b).CompareTo(GetDate(a)));
+        return pageItems;
     }
 
-    private static Instant GetDate(object item) => item switch
+    private bool IsAfterCursor(object o, Instant afterInstant, int afterId) => o switch
     {
-        Post post => post.Published ?? post.Created,
-        Event @event => @event.Start ?? @event.Created,
+        Post p => GetDate(p) < afterInstant || (GetDate(p) == afterInstant && p.Id < afterId),
+        Event e => GetDate(e) < afterInstant || (GetDate(e) == afterInstant && e.Id < afterId),
+        _ => false
+    };
+
+    private string GetCursor(object item) => item switch
+    {
+        Post post => $"{InstantPattern.ExtendedIso.Format(GetDate(post))},{post.Id}",
+        Event e => $"{InstantPattern.ExtendedIso.Format(GetDate(e))},{e.Id}",
         _ => throw new InvalidOperationException()
     };
 
-    private static int GetKey(object item) => item switch
+    private static Instant GetDate(object item) => item switch
     {
-        Post post => post.Id,
-        Event @event => int.MaxValue - @event.Id,
+        Post post => post.Published ?? post.Created,
+        Event @event => @event.Start ?? @event.Created,
         _ => throw new InvalidOperationException()
     };
 
diff --git a/StartSch/Components/Pages/PostEditPage.razor b/StartSch/Components/Pages/PostEditPage.razor
index d6f34697..f54d620d 100644
--- a/StartSch/Components/Pages/PostEditPage.razor
+++ b/StartSch/Components/Pages/PostEditPage.razor
@@ -11,6 +11,7 @@
 @inject NavigationManager Nav
 @inject IServiceProvider ServiceProvider
 @inject AuthorizationService AuthorizationService
+@inject InterestService InterestService
 
 @if (!IsResourceAvailable(_post, AuthorizationService.CanEdit, out var unavailableStatus))
 {
@@ -56,6 +57,79 @@
                 </label>
             </div>
 
+            <div>
+                <div style="display: flex; gap: 16px; margin-top: 16px;">
+                    <div style="flex: 1;">
+                        <div class="small filled round">
+                            Kiválasztott kollaboráló körök
+                        </div>
+
+                        @if (_model.CollaborationCategories.Count > 0)
+                        {
+                            <div style="margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px;">
+                                @foreach (var category in _model.CollaborationCategories)
+                                {
+                                    <div
+                                        style="display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border: 1px solid #ccc; border-radius: 12px;">
+                                        <span>@(category.Name ?? category.Page.Name ?? category.Page.PekName)</span>
+                                        <button type="button" @onclick="() => RemoveCollaborationCategory(category)">×
+                                        </button>
+                                    </div>
+                                }
+                            </div>
+                        }
+
+                        <div style="margin-top: 16px;">
+                            <span>Kollaboráló kör</span>
+                            <InputSelect TValue="int?" @bind-Value="@SelectedCollaborationCategoryId">
+                                <option value=""></option>
+                                @foreach (var e in _administeredCategories.Where(c => !_model.CollaborationCategories.Contains(c)).Distinct())
+                                {
+                                    <option value="@e.Id">
+                                        @(e.Name ?? e.Page.Name ?? e.Page.PekName)
+                                    </option>
+                                }
+                            </InputSelect>
+                        </div>
+                    </div>
+                    <div style="flex: 1;">
+                        <div class="small filled round">
+                            Kiválasztott kollaborálónak meghívható körök
+                        </div>
+
+                        @if (_model.PossibleCollaborationPages.Count > 0)
+                        {
+                            <div style="margin-top: 8px; display: flex; flex-wrap: wrap; gap: 8px;">
+                                @foreach (var page in _model.PossibleCollaborationPages)
+                                {
+                                    <div
+                                        style="display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border: 1px solid #ccc; border-radius: 12px;">
+                                        <span>@(page.Name ?? page.Name ?? page.PekName)</span>
+                                        <button type="button" @onclick="() => RemovePossibleCollaborationPage(page)">×
+                                        </button>
+                                    </div>
+                                }
+                            </div>
+                        }
+                        <div style="margin-top: 16px;">
+                            <span>Kollaborálónak meghívható kör</span>
+                            <InputSelect TValue="int?" @bind-Value="@SelectedPossibleCollaborationPageId">
+                                <option value=""></option>
+                                @foreach (var e in _possibleCollaborationPages)
+                                {
+                                    @if (e.Name != null || e.PekName != null)
+                                    {
+                                        <option value="@e.Id">
+                                            @(e.Name ?? e.PekName)
+                                        </option>
+                                    }
+                                }
+                            </InputSelect>
+                        </div>
+                    </div>
+                </div>
+            </div>
+
             <div>
                 <label>
                     <span style="display: block">
@@ -96,7 +170,7 @@
                 else
                 {
                     <expressive-button @onclick="@(() => _action = PostAction.Save)" type="submit" disabled="@_isBusy"
-                                      class="small filled round">
+                                       class="small filled round">
                         <md-icon slot="icon">amend</md-icon>
                         Javítás közzététele (értesítés nélkül)
                     </expressive-button>
@@ -106,8 +180,8 @@
                 {
                     // I don't know why type="button" is needed here but not in EventEditPage and at this point I'm too afraid to ask
                     <expressive-button href="@($"/posts/{_post.Id}/delete")"
-                                    class="small text round error standard" type="button" disabled="@_isBusy"
-                                    style="margin-left: auto">
+                                       class="small text round error standard" type="button" disabled="@_isBusy"
+                                       style="margin-left: auto">
                         <md-icon slot="icon">delete</md-icon>
                         Törlés
                     </expressive-button>
@@ -115,7 +189,7 @@
             </div>
         </EditForm>
     </Form>
-    
+
     <Previews>
         @{
             _post.Title = _model.Title;
@@ -153,6 +227,10 @@
     private PostAction _action = PostAction.Publish;
     private readonly NewPostModel _model = new();
     private bool _isBusy;
+    private int? _selectedCollaborationCategoryId;
+    private List<Page>? _administeredPages;
+    private readonly List<Category> _administeredCategories = [];
+    private List<Page> _possibleCollaborationPages = [];
 
     [Parameter] public int PostId { get; set; }
 
@@ -166,6 +244,13 @@
     {
         await using var db = await DbFactory.CreateDbContextAsync();
 
+        var index = await InterestService.LoadIndex;
+        _administeredPages = index.GetPages(AuthorizationService.AdministeredPageIds);
+        if (_administeredPages != null)
+        {
+            _administeredPages.ForEach(p => { _administeredCategories.AddRange(p.Categories); });
+        }
+
         if (PostId == 0) // new post
         {
             Post post = new() { Created = new() };
@@ -193,6 +278,11 @@
                 post.Event = @event;
             }
 
+            var administeredPageIds = _administeredPages?.Select(p => p.Id).ToList() ?? [];
+            _possibleCollaborationPages = await db.Pages
+                .Where(p => !administeredPageIds.Contains(p.Id))
+                .ToListAsync();
+
             _model.EventId = EventId;
             _post = post;
         }
@@ -205,10 +295,16 @@
                 .FirstOrDefaultAsync(p => p.Id == PostId);
             if (_post == null)
                 return;
+
             _model.Title = _post.Title;
             _model.ContentMarkdown = _post.ContentMarkdown;
             _model.ExcerptMarkdown = _post.ExcerptMarkdown;
             _model.EventId = _post.Event?.Id;
+            _model.CollaborationCategories = _post.Categories.ToList();
+            _model.PossibleCollaborationPages = await db.PostCollaborationRequests
+                .Where(r => r.PostId == _post.Id)
+                .Select(r => r.Page)
+                .ToListAsync();
         }
 
         if (_post.Event != null)
@@ -247,25 +343,79 @@
 
         await using var scope = ServiceProvider.CreateAsyncScope();
         var postService = scope.ServiceProvider.GetRequiredService<PostService>();
-
+    
         Post post = await postService.Save(
             PostId,
             _model.EventId,
             _post!.Categories.Select(c => c.Id).ToHashSet(),
+            _model.PossibleCollaborationPages.Select(p => p.Id).ToHashSet(),
             _model.Title,
             _model.ContentMarkdown,
             _model.ExcerptMarkdown,
-            _action);
+            _action
+        );
 
         Nav.NavigateTo($"/posts/{post.Id}");
     }
 
+    private int? SelectedCollaborationCategoryId
+    {
+        get => _selectedCollaborationCategoryId;
+        set
+        {
+            _selectedCollaborationCategoryId = value;
+            if (value.HasValue)
+            {
+                var category = _administeredCategories.FirstOrDefault(c => c.Id == value.Value);
+                if (category != null)
+                {
+                    if (!_model.CollaborationCategories.Contains(category))
+                        _model.CollaborationCategories.Add(category);
+                }
+
+                _selectedCollaborationCategoryId = null;
+            }
+        }
+    }
+
+    private void RemoveCollaborationCategory(Category category)
+    {
+        _model.CollaborationCategories.Remove(category);
+    }
+
+    private int? SelectedPossibleCollaborationPageId
+    {
+        get => _selectedCollaborationCategoryId;
+        set
+        {
+            _selectedCollaborationCategoryId = value;
+            if (value.HasValue)
+            {
+                var page = _possibleCollaborationPages.FirstOrDefault(p => p.Id == value.Value);
+                if (page != null)
+                {
+                    if (!_model.PossibleCollaborationPages.Contains(page))
+                        _model.PossibleCollaborationPages.Add(page);
+                }
+
+                _selectedCollaborationCategoryId = null;
+            }
+        }
+    }
+
+    private void RemovePossibleCollaborationPage(Page page)
+    {
+        _model.PossibleCollaborationPages.Remove(page);
+    }
+
     private class NewPostModel
     {
         public int? EventId { get; set; }
         [Length(1, 100)] public string Title { get; set; } = "";
         [MaxLength(20000)] public string? ContentMarkdown { get; set; }
         [MaxLength(1000)] public string? ExcerptMarkdown { get; set; }
+        public List<Category> CollaborationCategories { get; set; } = [];
+        public List<Page> PossibleCollaborationPages { get; set; } = [];
     }
 
 }
diff --git a/StartSch/Components/Shared/InfiniteList.razor b/StartSch/Components/Shared/InfiniteList.razor
index c89cf0f7..4ec491cb 100644
--- a/StartSch/Components/Shared/InfiniteList.razor
+++ b/StartSch/Components/Shared/InfiniteList.razor
@@ -1,29 +1,61 @@
 @typeparam TItem
 
 @{
-    int count = Items.Count;
+    int count = _items.Count;
     int triggerIndex = count / 2;
 }
 
 @for (int i = 0; i < count; i++)
 {
-    if (HasMore && i == triggerIndex)
+    if (_hasMore && i == triggerIndex)
     {
-        <div hx-get="@NextLink" hx-trigger="intersect once" hx-target="#@_insertionPointId" hx-swap="outerHTML"></div>
+        <div hx-get="@_nextLink" hx-trigger="intersect once" hx-target="#@_insertionPointId" hx-swap="outerHTML"></div>
     }
-    
-    @ItemTemplate(Items[i])
+
+    @ItemTemplate(_items[i])
 }
 
-@if (HasMore)
+@if (_hasMore)
 {
     <div id="@_insertionPointId"></div>
 }
 
 @code {
     private readonly string _insertionPointId = "insertion-point-" + Guid.NewGuid().ToString("N");
-    [Parameter, EditorRequired] public string? NextLink { get; set; }
+    private List<TItem> _items = [];
+    private bool _hasMore;
+    private string? _nextLink;
+
+    /// <summary>
+    /// Fetches a page of items. Receives the raw cursor string (null for first page).
+    /// </summary>
+    [Parameter, EditorRequired] public required Func<string?, Task<List<TItem>>> FetchPage { get; set; }
+
+    /// <summary>
+    /// Extracts the cursor string from the last item of a page, used to build the next link.
+    /// </summary>
+    [Parameter, EditorRequired] public required Func<TItem, string> GetCursor { get; set; }
+
+    /// <summary>
+    /// The base URL path for the next page link, e.g. "/openings". The cursor will be appended as ?after=...
+    /// </summary>
+    [Parameter, EditorRequired] public required string BaseUrl { get; set; }
+
+    /// <summary>
+    /// The initial cursor from the query string (null for the first page).
+    /// </summary>
+    [Parameter] public string? After { get; set; }
+
+    [Parameter] public int PageSize { get; set; } = 30;
+
     [Parameter, EditorRequired] public required RenderFragment<TItem> ItemTemplate { get; set; }
-    [Parameter, EditorRequired] public required List<TItem> Items { get; set; }
-    [Parameter, EditorRequired] public bool HasMore { get; set; }
+
+    protected override async Task OnInitializedAsync()
+    {
+        var page = await FetchPage(After);
+        _items = page;
+        _hasMore = page.Count == PageSize;
+        if (_hasMore)
+            _nextLink = $"{BaseUrl}?after={Uri.EscapeDataString(GetCursor(page[^1]))}";
+    }
 }
diff --git a/StartSch/Data/CollaborationRequest.cs b/StartSch/Data/CollaborationRequest.cs
new file mode 100644
index 00000000..744e2bb4
--- /dev/null
+++ b/StartSch/Data/CollaborationRequest.cs
@@ -0,0 +1,20 @@
+namespace StartSch.Data;
+
+public abstract class CollaborationRequest
+{
+    public int Id { get; set; }
+    public int PageId { get; set; }
+    public Page Page { get; set; } = null!;
+}
+
+public class EventCollaborationRequest : CollaborationRequest
+{
+    public int EventId { get; set; }
+    public Event Event { get; set; } = null!;
+}
+
+public class PostCollaborationRequest : CollaborationRequest
+{
+    public int PostId { get; set; }
+    public Post Post { get; set; } = null!;
+}
diff --git a/StartSch/Data/Db.cs b/StartSch/Data/Db.cs
index 93384a23..e8244e2a 100644
--- a/StartSch/Data/Db.cs
+++ b/StartSch/Data/Db.cs
@@ -15,10 +15,13 @@ public class Db(DbContextOptions options) : DbContext(options), IDataProtectionK
     public DbSet<Post> Posts => Set<Post>();
     public DbSet<PushSubscription> PushSubscriptions => Set<PushSubscription>();
     public DbSet<User> Users => Set<User>();
-
+    
     public DbSet<Interest> Interests => Set<Interest>();
     public DbSet<CategoryInterest> CategoryInterests => Set<CategoryInterest>();
     public DbSet<EventInterest> EventInterests => Set<EventInterest>();
+    public DbSet<CollaborationRequest> CollaborationRequests => Set<CollaborationRequest>();
+    public DbSet<EventCollaborationRequest> EventCollaborationRequests => Set<EventCollaborationRequest>();
+    public DbSet<PostCollaborationRequest> PostCollaborationRequests => Set<PostCollaborationRequest>();
     public DbSet<ShowEventsInCategory> ShowEventsInCategory => Set<ShowEventsInCategory>();
     public DbSet<ShowPostsForEvent> ShowPostsForEvent => Set<ShowPostsForEvent>();
     public DbSet<ShowPostsInCategory> ShowPostsInCategory => Set<ShowPostsInCategory>();
diff --git a/StartSch/Data/Migrations/Sqlite/SqliteDbModelSnapshot.cs b/StartSch/Data/Migrations/Sqlite/SqliteDbModelSnapshot.cs
index 6bd000e0..fca76402 100644
--- a/StartSch/Data/Migrations/Sqlite/SqliteDbModelSnapshot.cs
+++ b/StartSch/Data/Migrations/Sqlite/SqliteDbModelSnapshot.cs
@@ -106,6 +106,31 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.ToTable("CategoryIncludes");
                 });
 
+            modelBuilder.Entity("StartSch.Data.CollaborationRequest", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Discriminator")
+                        .IsRequired()
+                        .HasMaxLength(34)
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("PageId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("PageId");
+
+                    b.ToTable("CollaborationRequests");
+
+                    b.HasDiscriminator().HasValue("CollaborationRequest");
+
+                    b.UseTphMappingStrategy();
+                });
+
             modelBuilder.Entity("StartSch.Data.EmailMessage", b =>
                 {
                     b.Property<int>("Id")
@@ -528,6 +553,30 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.HasDiscriminator().HasValue("SendPushNotification");
                 });
 
+            modelBuilder.Entity("StartSch.Data.EventCollaborationRequest", b =>
+                {
+                    b.HasBaseType("StartSch.Data.CollaborationRequest");
+
+                    b.Property<int>("EventId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasIndex("EventId");
+
+                    b.HasDiscriminator().HasValue("EventCollaborationRequest");
+                });
+
+            modelBuilder.Entity("StartSch.Data.PostCollaborationRequest", b =>
+                {
+                    b.HasBaseType("StartSch.Data.CollaborationRequest");
+
+                    b.Property<int>("PostId")
+                        .HasColumnType("INTEGER");
+
+                    b.HasIndex("PostId");
+
+                    b.HasDiscriminator().HasValue("PostCollaborationRequest");
+                });
+
             modelBuilder.Entity("StartSch.Data.PincerOpening", b =>
                 {
                     b.HasBaseType("StartSch.Data.Event");
@@ -667,6 +716,17 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.Navigation("Includer");
                 });
 
+            modelBuilder.Entity("StartSch.Data.CollaborationRequest", b =>
+                {
+                    b.HasOne("StartSch.Data.Page", "Page")
+                        .WithMany()
+                        .HasForeignKey("PageId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Page");
+                });
+
             modelBuilder.Entity("StartSch.Data.Event", b =>
                 {
                     b.HasOne("StartSch.Data.Event", "Parent")
@@ -805,6 +865,28 @@ protected override void BuildModel(ModelBuilder modelBuilder)
                     b.Navigation("User");
                 });
 
+            modelBuilder.Entity("StartSch.Data.EventCollaborationRequest", b =>
+                {
+                    b.HasOne("StartSch.Data.Event", "Event")
+                        .WithMany()
+                        .HasForeignKey("EventId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Event");
+                });
+
+            modelBuilder.Entity("StartSch.Data.PostCollaborationRequest", b =>
+                {
+                    b.HasOne("StartSch.Data.Post", "Post")
+                        .WithMany()
+                        .HasForeignKey("PostId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Post");
+                });
+
             modelBuilder.Entity("StartSch.Data.CategoryInterest", b =>
                 {
                     b.HasOne("StartSch.Data.Category", "Category")
diff --git a/StartSch/Services/EventService.cs b/StartSch/Services/EventService.cs
index d03ee898..362af740 100644
--- a/StartSch/Services/EventService.cs
+++ b/StartSch/Services/EventService.cs
@@ -12,6 +12,7 @@ public async Task<Event> Save(
         int eventId,
         int? parentId,
         HashSet<int> categoryIds,
+        HashSet<int> possibleCollaborationRequestPageIds,
         string title,
         string? descriptionMd,
         Instant? start,
@@ -44,6 +45,28 @@ await db.Categories
             authorizationService.CheckCreate(@event);
 
             db.Events.Add(@event);
+            
+            // Save collaboration
+            if (possibleCollaborationRequestPageIds.Count > 0)
+            {
+                // Looking up the pages might not be needed, ALBI shall decide
+                var pages = await db.Pages
+                    .Where(p => possibleCollaborationRequestPageIds.Contains(p.Id))
+                    .ToListAsync();
+
+                var collaborationRequests = possibleCollaborationRequestPageIds
+                    .Select(pageId => new EventCollaborationRequest
+                    {
+                        PageId = pageId,
+                        Page = pages.First(p => p.Id == pageId),
+                        Event = @event,
+                        EventId = @event.Id
+                    })
+                    .ToList();
+
+                db.EventCollaborationRequests.AddRange(collaborationRequests);
+            }
+
         }
         else // Update existing event
         {
@@ -74,6 +97,27 @@ await db.Categories
             @event.End = end;
             @event.Title = title;
             @event.DescriptionMarkdown = descriptionMd;
+            
+            // Update collaboration requests
+            var existingCollaborationRequests = await db.EventCollaborationRequests
+                .Where(ecr => ecr.EventId == eventId)
+                .ToListAsync();
+
+            db.EventCollaborationRequests.RemoveRange(existingCollaborationRequests);
+
+            if (possibleCollaborationRequestPageIds.Count > 0)
+            {
+                var collaborationRequests = possibleCollaborationRequestPageIds
+                    .Select(pageId => new EventCollaborationRequest
+                    {
+                        PageId = pageId,
+                        Event = @event,
+                        EventId = @event.Id
+                    })
+                    .ToList();
+
+                db.EventCollaborationRequests.AddRange(collaborationRequests);
+            }
         }
 
         await db.SaveChangesAsync();
diff --git a/StartSch/Services/PostService.cs b/StartSch/Services/PostService.cs
index bf06d901..91518e7a 100644
--- a/StartSch/Services/PostService.cs
+++ b/StartSch/Services/PostService.cs
@@ -14,6 +14,7 @@ public async Task<Post> Save(
         int postId,
         int? eventId,
         HashSet<int> categoryIds,
+        HashSet<int> possibleCollaborationRequestPageIds,
         string title,
         string? contentMd,
         string? excerptMd,
@@ -45,6 +46,26 @@ await db.Categories
             authorizationService.CheckCreate(post);
 
             db.Posts.Add(post);
+            
+            // Save collaboration
+            if (possibleCollaborationRequestPageIds.Count > 0)
+            {
+                var pages = await db.Pages
+                    .Where(p => possibleCollaborationRequestPageIds.Contains(p.Id))
+                    .ToListAsync();
+
+                var collaborationRequests = possibleCollaborationRequestPageIds
+                    .Select(pageId => new PostCollaborationRequest
+                    {
+                        PageId = pageId,
+                        Page = pages.First(p => p.Id == pageId),
+                        Post = post,
+                        PostId = post.Id
+                    })
+                    .ToList();
+
+                db.PostCollaborationRequests.AddRange(collaborationRequests);
+            }
         }
         else
         {
@@ -74,6 +95,27 @@ await db.Categories
             post.Title = title;
             post.ExcerptMarkdown = excerptMd;
             post.ContentMarkdown = contentMd;
+            
+            // Update collaboration requests
+            var existingCollaborationRequests = await db.PostCollaborationRequests
+                .Where(pcr => pcr.PostId == postId)
+                .ToListAsync();
+
+            db.PostCollaborationRequests.RemoveRange(existingCollaborationRequests);
+
+            if (possibleCollaborationRequestPageIds.Count > 0)
+            {
+                var collaborationRequests = possibleCollaborationRequestPageIds
+                    .Select(pageId => new PostCollaborationRequest
+                    {
+                        PageId = pageId,
+                        Post = post,
+                        PostId = post.Id
+                    })
+                    .ToList();
+
+                db.PostCollaborationRequests.AddRange(collaborationRequests);
+            }
         }
 
         if (action == PostAction.Publish)
@@ -81,7 +123,8 @@ await db.Categories
             if (post.Published.HasValue)
                 throw new InvalidOperationException("Post is already published.");
             post.Published = SystemClock.Instance.GetCurrentInstant();
-            db.CreatePostPublishedNotifications.Add(new() { Created = SystemClock.Instance.GetCurrentInstant(), Post = post });
+            db.CreatePostPublishedNotifications.Add(new()
+                { Created = SystemClock.Instance.GetCurrentInstant(), Post = post });
         }
 
         await db.SaveChangesAsync();
diff --git a/StartSch/Services/UserInfoService.cs b/StartSch/Services/UserInfoService.cs
index 51201496..e012320f 100644
--- a/StartSch/Services/UserInfoService.cs
+++ b/StartSch/Services/UserInfoService.cs
@@ -19,7 +19,6 @@ public async Task OnUserInformationReceived(UserInformationReceivedContext conte
 
         // Ensure we don't create the same Page twice
         await using var tx = await db.BeginTransaction(IsolationLevel.Serializable);
-        
         User user = await db.Users
                         .FirstOrDefaultAsync(u => u.AuthSchId == authSchId)
                     ?? db.Users.Add(new() { AuthSchId = authSchId }).Entity;
@@ -92,7 +91,6 @@ public async Task OnUserInformationReceived(UserInformationReceivedContext conte
         int updates = await db.SaveChangesAsync();
 
         await tx.CommitAsync();
-        
         if (updates > 0)
             cache.Remove(InterestService.CacheKey);
 
diff --git a/StartSch/appsettings.Development.json b/StartSch/appsettings.Development.json
index c7ae5353..eda68355 100644
--- a/StartSch/appsettings.Development.json
+++ b/StartSch/appsettings.Development.json
@@ -1,7 +1,9 @@
 {
+    "DetailedErrors": true,
     "Logging": {
         "LogLevel": {
-            "Default": "Information"
+            "Default": "Information",
+            "Microsoft.AspNetCore.SignalR": "Debug"
         }
     },
     "ConnectionStrings": {