diff --git a/app/Livewire/OnlineCalendar.php b/app/Livewire/OnlineCalendar.php
index 57e65d30f..1e9a7c03d 100644
--- a/app/Livewire/OnlineCalendar.php
+++ b/app/Livewire/OnlineCalendar.php
@@ -33,16 +33,14 @@ public function mount()
             ->orderBy('start_date')
             ->get(['start_date'])
             ->groupBy(function ($event) {
-                $date = Carbon::parse($event->start_date);
-
-                return $date->month.'/'.$date->year;
+                return $this->effectiveStart($event->start_date)->format('n/Y');
             })
             ->map(function ($group, $id) {
-                $date = Carbon::parse($group->first()->start_date);
+                [$month, $year] = explode('/', $id);
 
                 return [
                     'id' => $id,
-                    'name' => $date->format('F').' '.$date->year,
+                    'name' => Carbon::createFromDate((int) $year, (int) $month, 1)->format('F Y'),
                 ];
             })
             ->values()
@@ -68,11 +66,22 @@ public function render()
             $this->selectedMonth = (int) ($parts[0] ?: $this->selectedMonth);
             $this->selectedYear = (int) ($parts[1] ?? $this->selectedYear);
 
-            $query->whereMonth('start_date', $this->selectedMonth)
-                ->whereYear('start_date', $this->selectedYear);
+            $monthStart = Carbon::createFromDate($this->selectedYear, $this->selectedMonth, 1)->startOfMonth();
+
+            $query->where(function ($monthQuery) use ($monthStart) {
+                $monthQuery->whereBetween('start_date', [$monthStart, $monthStart->copy()->endOfMonth()]);
+
+                if ($monthStart->isSameMonth(Carbon::now())) {
+                    $monthQuery->orWhere('start_date', '<', $monthStart);
+                }
+            });
         }
 
-        $events = $query->get();
+        $events = $query->get()
+            ->sortBy(function ($event) {
+                return $this->effectiveStart($event->start_date)->getTimestamp();
+            })
+            ->values();
 
         $events->each(function ($event) {
             $event->title = str_limit($event->title, 50);
@@ -124,12 +133,24 @@ public function render()
 
     private function baseQuery()
     {
+        // Only the end date gates the list: an activity that began earlier but has not
+        // finished is still open to participants.
         return Event::where([
             'activity_type' => 'open-online',
             'status' => 'APPROVED',
-        ])
-            ->where('start_date', '>=', Carbon::now()->firstOfMonth())
-            ->where('end_date', '>=', Carbon::now());
+        ])->where('end_date', '>=', Carbon::now());
+    }
+
+    /**
+     * Activities already under way are listed under the current month rather than the
+     * month they originally started in, which may be long past.
+     */
+    private function effectiveStart($startDate): Carbon
+    {
+        $start = Carbon::parse($startDate);
+        $currentMonth = Carbon::now()->firstOfMonth();
+
+        return $start->lessThan($currentMonth) ? $currentMonth : $start;
     }
 
     private function eventMatchesLanguage($event, string $selectedLanguage): bool
diff --git a/tests/Feature/OnlineEventsWorkflowTest.php b/tests/Feature/OnlineEventsWorkflowTest.php
index 53c764c09..4d366262c 100644
--- a/tests/Feature/OnlineEventsWorkflowTest.php
+++ b/tests/Feature/OnlineEventsWorkflowTest.php
@@ -317,6 +317,71 @@ public function featured_activities_month_filter_only_shows_events_for_selected_
             ->assertDontSee($novemberEvent->title);
     }
 
+    #[Test]
+    public function featured_activities_page_lists_activities_already_under_way(): void
+    {
+        $this->seed('RolesAndPermissionsSeeder');
+
+        $ongoing = \App\Event::factory()->create([
+            'start_date' => Carbon::now()->subMonths(4),
+            'end_date' => Carbon::now()->addMonths(6),
+            'status' => 'APPROVED',
+            'activity_type' => 'open-online',
+            'highlighted_status' => 'NONE',
+            'language' => ['en'],
+            'title' => 'Still Running Open Online Activity',
+        ]);
+
+        $finished = \App\Event::factory()->create([
+            'start_date' => Carbon::now()->subMonths(4),
+            'end_date' => Carbon::now()->subMonth(),
+            'status' => 'APPROVED',
+            'activity_type' => 'open-online',
+            'highlighted_status' => 'NONE',
+            'language' => ['en'],
+            'title' => 'Already Finished Open Online Activity',
+        ]);
+
+        $this->get('/featured-activities')
+            ->assertStatus(200)
+            ->assertSee($ongoing->title)
+            ->assertDontSee($finished->title);
+    }
+
+    #[Test]
+    public function activities_already_under_way_are_listed_under_the_current_month(): void
+    {
+        $this->seed('RolesAndPermissionsSeeder');
+
+        $startedFourMonthsAgo = Carbon::now()->subMonths(4);
+
+        $ongoing = \App\Event::factory()->create([
+            'start_date' => $startedFourMonthsAgo,
+            'end_date' => Carbon::now()->addMonths(6),
+            'status' => 'APPROVED',
+            'activity_type' => 'open-online',
+            'highlighted_status' => 'NONE',
+            'language' => ['en'],
+            'title' => 'Ongoing Grouped Under Current Month',
+        ]);
+
+        $now = Carbon::now();
+
+        \Livewire\Livewire::test(\App\Livewire\OnlineCalendar::class)
+            ->set('selectedDate', $now->month.'/'.$now->year)
+            ->assertSee($ongoing->title);
+
+        $monthIds = collect(\Livewire\Livewire::test(\App\Livewire\OnlineCalendar::class)->get('months'))
+            ->pluck('id');
+
+        $this->assertContains($now->month.'/'.$now->year, $monthIds);
+        $this->assertNotContains(
+            $startedFourMonthsAgo->month.'/'.$startedFourMonthsAgo->year,
+            $monthIds,
+            'The month filter should not offer a past month just because an ongoing activity started then.'
+        );
+    }
+
     #[Test]
     public function promoted_event_creates_notification_for_administrators(): void
     {