diff --git a/src/addons/calendar/pages/day/day.ts b/src/addons/calendar/pages/day/day.ts
index 6097d8af7..2a57565f9 100644
--- a/src/addons/calendar/pages/day/day.ts
+++ b/src/addons/calendar/pages/day/day.ts
@@ -65,15 +65,8 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
     protected currentSiteId: string;
 
     // Observers.
-    protected newEventObserver: CoreEventObserver;
-    protected discardedObserver: CoreEventObserver;
-    protected editEventObserver: CoreEventObserver;
-    protected deleteEventObserver: CoreEventObserver;
-    protected undeleteEventObserver: CoreEventObserver;
-    protected syncObserver: CoreEventObserver;
-    protected manualSyncObserver: CoreEventObserver;
+    protected eventObservers: CoreEventObserver[] = [];
     protected onlineObserver: Subscription;
-    protected filterChangedObserver: CoreEventObserver;
     protected managerUnsubscribe?: () => void;
     protected logView: () => void;
 
@@ -97,7 +90,7 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
         this.currentSiteId = CoreSites.getCurrentSiteId();
 
         // Listen for events added. When an event is added, reload the data.
-        this.newEventObserver = CoreEvents.on(
+        this.eventObservers.push(CoreEvents.on(
             AddonCalendarProvider.NEW_EVENT_EVENT,
             (data) => {
                 if (data && data.eventId) {
@@ -106,16 +99,16 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
                 }
             },
             this.currentSiteId,
-        );
+        ));
 
         // Listen for new event discarded event. When it does, reload the data.
-        this.discardedObserver = CoreEvents.on(AddonCalendarProvider.NEW_EVENT_DISCARDED_EVENT, () => {
+        this.eventObservers.push(CoreEvents.on(AddonCalendarProvider.NEW_EVENT_DISCARDED_EVENT, () => {
             this.manager?.getSource().markAllItemsUnloaded();
             this.refreshData(true, true);
-        }, this.currentSiteId);
+        }, this.currentSiteId));
 
         // Listen for events edited. When an event is edited, reload the data.
-        this.editEventObserver = CoreEvents.on(
+        this.eventObservers.push(CoreEvents.on(
             AddonCalendarProvider.EDIT_EVENT_EVENT,
             (data) => {
                 if (data && data.eventId) {
@@ -124,25 +117,25 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
                 }
             },
             this.currentSiteId,
-        );
+        ));
 
         // Refresh data if calendar events are synchronized automatically.
-        this.syncObserver = CoreEvents.on(AddonCalendarSyncProvider.AUTO_SYNCED, () => {
+        this.eventObservers.push(CoreEvents.on(AddonCalendarSyncProvider.AUTO_SYNCED, () => {
             this.manager?.getSource().markAllItemsUnloaded();
             this.refreshData(false, true);
-        }, this.currentSiteId);
+        }, this.currentSiteId));
 
         // Refresh data if calendar events are synchronized manually but not by this page.
-        this.manualSyncObserver = CoreEvents.on(AddonCalendarSyncProvider.MANUAL_SYNCED, (data) => {
+        this.eventObservers.push(CoreEvents.on(AddonCalendarSyncProvider.MANUAL_SYNCED, (data) => {
             const selectedDay = this.manager?.getSelectedItem();
             if (data && (data.source != 'day' || !selectedDay || !data.moment || !selectedDay.moment.isSame(data.moment, 'day'))) {
                 this.manager?.getSource().markAllItemsUnloaded();
                 this.refreshData(false, true);
             }
-        }, this.currentSiteId);
+        }, this.currentSiteId));
 
         // Update the events when an event is deleted.
-        this.deleteEventObserver = CoreEvents.on(
+        this.eventObservers.push(CoreEvents.on(
             AddonCalendarProvider.DELETED_EVENT_EVENT,
             (data) => {
                 if (data && !data.sent) {
@@ -154,10 +147,10 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
                 }
             },
             this.currentSiteId,
-        );
+        ));
 
         // Listen for events "undeleted" (offline).
-        this.undeleteEventObserver = CoreEvents.on(
+        this.eventObservers.push(CoreEvents.on(
             AddonCalendarProvider.UNDELETED_EVENT_EVENT,
             (data) => {
                 if (!data || !data.eventId) {
@@ -168,9 +161,9 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
                 this.manager?.getSource().markAsDeleted(data.eventId, false);
             },
             this.currentSiteId,
-        );
+        ));
 
-        this.filterChangedObserver = CoreEvents.on(
+        this.eventObservers.push(CoreEvents.on(
             AddonCalendarProvider.FILTER_CHANGED_EVENT,
             async (data) => {
                 this.filter = data;
@@ -180,7 +173,7 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
 
                 this.manager?.getSource().filterAllDayEvents(this.filter);
             },
-        );
+        ));
 
         // Refresh online status when changes.
         this.onlineObserver = CoreNetwork.onChange().subscribe(() => {
@@ -214,7 +207,7 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
     }
 
     /**
-     * View loaded.
+     * @inheritdoc
      */
     ngOnInit(): void {
         const types: string[] = [];
@@ -470,18 +463,11 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
     }
 
     /**
-     * Page destroyed.
+     * @inheritdoc
      */
     ngOnDestroy(): void {
-        this.newEventObserver?.off();
-        this.discardedObserver?.off();
-        this.editEventObserver?.off();
-        this.deleteEventObserver?.off();
-        this.undeleteEventObserver?.off();
-        this.syncObserver?.off();
-        this.manualSyncObserver?.off();
+        this.eventObservers.forEach((observer) => observer.off());
         this.onlineObserver?.unsubscribe();
-        this.filterChangedObserver?.off();
         this.manager?.getSource().forgetRelatedSources();
         this.manager?.destroy();
         this.managerUnsubscribe?.();