Update apps/events/tests/test_templates.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: iampujan

apps/events/tests/test_templates.py

@@ -14,7 +14,10 @@ def test_single_day_event_year_rendering(self):
         # Create a single day event in the future to trigger the year rendering condition
         future_year = datetime.date.today().year + 1
 
-        calendar = Calendar.objects.create(name="Test Calendar")
+        calendar = Calendar.objects.create(
+            name="Test Calendar",
+            slug="test-calendar-time-tag-single-day-event",
+        )
 
         event = Event.objects.create(
             title="Single Day Future Event",