feat(models.py): add EventPage.is_past property

home/models.py

@@ -123,6 +123,12 @@ class EventPage(Page):
     def attendees_count(self):
         return self.signed_up_users.count()  # pyright: ignore[reportAttributeAccessIssue]
 
+    @property
+    def is_past(self):
+        from django.utils import timezone
+
+        return self.end < timezone.now()
+
     def _user_signed_up(self, user):
         if not user.is_authenticated:
             return False