diff --git a/app/Livewire/OnlineCalendar.php b/app/Livewire/OnlineCalendar.php
index 1e9a7c03d..d4bc9f407 100644
--- a/app/Livewire/OnlineCalendar.php
+++ b/app/Livewire/OnlineCalendar.php
@@ -33,7 +33,7 @@ public function mount()
             ->orderBy('start_date')
             ->get(['start_date'])
             ->groupBy(function ($event) {
-                return $this->effectiveStart($event->start_date)->format('n/Y');
+                return Carbon::parse($event->start_date)->format('n/Y');
             })
             ->map(function ($group, $id) {
                 [$month, $year] = explode('/', $id);
@@ -68,20 +68,10 @@ public function render()
 
             $monthStart = Carbon::createFromDate($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);
-                }
-            });
+            $query->whereBetween('start_date', [$monthStart, $monthStart->copy()->endOfMonth()]);
         }
 
-        $events = $query->get()
-            ->sortBy(function ($event) {
-                return $this->effectiveStart($event->start_date)->getTimestamp();
-            })
-            ->values();
+        $events = $query->get();
 
         $events->each(function ($event) {
             $event->title = str_limit($event->title, 50);
@@ -133,24 +123,12 @@ 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.
+        // The start date alone decides what is upcoming. Gating on the end date instead
+        // surfaced activities starting in 2020-2022 that carry an end date years away.
         return Event::where([
             'activity_type' => 'open-online',
             'status' => 'APPROVED',
-        ])->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;
+        ])->where('start_date', '>=', Carbon::today());
     }
 
     private function eventMatchesLanguage($event, string $selectedLanguage): bool
diff --git a/tests/Feature/OnlineEventsWorkflowTest.php b/tests/Feature/OnlineEventsWorkflowTest.php
index 66084cc70..37f772623 100644
--- a/tests/Feature/OnlineEventsWorkflowTest.php
+++ b/tests/Feature/OnlineEventsWorkflowTest.php
@@ -321,67 +321,86 @@ public function online_activities_month_filter_only_shows_events_for_selected_mo
     }
 
     #[Test]
-    public function online_activities_page_lists_activities_already_under_way(): void
+    public function online_activities_page_excludes_activities_that_already_started(): void
     {
         $this->seed('RolesAndPermissionsSeeder');
 
-        $ongoing = \App\Event::factory()->create([
-            'start_date' => Carbon::now()->subMonths(4),
-            'end_date' => Carbon::now()->addMonths(6),
+        // Reported by the community: activities dated 2020-2022 were on the page because
+        // they carry an end date years in the future.
+        $staleStartDate = \App\Event::factory()->create([
+            'start_date' => Carbon::now()->subYears(5),
+            'end_date' => Carbon::now()->addYear(),
             'status' => 'APPROVED',
             'activity_type' => 'open-online',
             'highlighted_status' => 'NONE',
             'language' => ['en'],
-            'title' => 'Still Running Open Online Activity',
+            'title' => 'Started Years Ago Ends Far Away',
         ]);
 
-        $finished = \App\Event::factory()->create([
-            'start_date' => Carbon::now()->subMonths(4),
-            'end_date' => Carbon::now()->subMonth(),
+        $startedThisMonth = \App\Event::factory()->create([
+            'start_date' => Carbon::now()->startOfMonth(),
+            'end_date' => Carbon::now()->addMonths(2),
             'status' => 'APPROVED',
             'activity_type' => 'open-online',
             'highlighted_status' => 'NONE',
             'language' => ['en'],
-            'title' => 'Already Finished Open Online Activity',
+            'title' => 'Started Earlier This Month',
+        ]);
+
+        $upcoming = \App\Event::factory()->create([
+            'start_date' => Carbon::now()->addWeek(),
+            'end_date' => Carbon::now()->addWeek()->addDay(),
+            'status' => 'APPROVED',
+            'activity_type' => 'open-online',
+            'highlighted_status' => 'NONE',
+            'language' => ['en'],
+            'title' => 'Genuinely Upcoming Activity',
         ]);
 
         $this->get('/online-activities')
             ->assertStatus(200)
-            ->assertSee($ongoing->title)
-            ->assertDontSee($finished->title);
+            ->assertSee($upcoming->title)
+            ->assertDontSee($staleStartDate->title)
+            ->assertDontSee($startedThisMonth->title);
     }
 
     #[Test]
-    public function activities_already_under_way_are_listed_under_the_current_month(): void
+    public function the_month_filter_only_offers_months_that_are_still_to_come(): void
     {
         $this->seed('RolesAndPermissionsSeeder');
 
-        $startedFourMonthsAgo = Carbon::now()->subMonths(4);
+        $pastStart = Carbon::now()->subYears(5);
 
-        $ongoing = \App\Event::factory()->create([
-            'start_date' => $startedFourMonthsAgo,
-            'end_date' => Carbon::now()->addMonths(6),
+        \App\Event::factory()->create([
+            'start_date' => $pastStart,
+            'end_date' => Carbon::now()->addYear(),
             'status' => 'APPROVED',
             'activity_type' => 'open-online',
             'highlighted_status' => 'NONE',
             'language' => ['en'],
-            'title' => 'Ongoing Grouped Under Current Month',
+            'title' => 'Stale Start Date Activity',
         ]);
 
-        $now = Carbon::now();
+        $nextMonth = Carbon::now()->addMonthNoOverflow()->startOfMonth();
 
-        \Livewire\Livewire::test(\App\Livewire\OnlineCalendar::class)
-            ->set('selectedDate', $now->month.'/'.$now->year)
-            ->assertSee($ongoing->title);
+        \App\Event::factory()->create([
+            'start_date' => $nextMonth->copy()->addDays(3),
+            'end_date' => $nextMonth->copy()->addDays(4),
+            'status' => 'APPROVED',
+            'activity_type' => 'open-online',
+            'highlighted_status' => 'NONE',
+            'language' => ['en'],
+            'title' => 'Next Month Activity',
+        ]);
 
         $monthIds = collect(\Livewire\Livewire::test(\App\Livewire\OnlineCalendar::class)->get('months'))
             ->pluck('id');
 
-        $this->assertContains($now->month.'/'.$now->year, $monthIds);
+        $this->assertContains($nextMonth->month.'/'.$nextMonth->year, $monthIds);
         $this->assertNotContains(
-            $startedFourMonthsAgo->month.'/'.$startedFourMonthsAgo->year,
+            $pastStart->month.'/'.$pastStart->year,
             $monthIds,
-            'The month filter should not offer a past month just because an ongoing activity started then.'
+            'A past month must not appear in the filter just because an activity carries a far-off end date.'
         );
     }