diff --git a/calsocial/calendar_system/gregorian.py b/calsocial/calendar_system/gregorian.py
index b9dd802..0967b0d 100644
--- a/calsocial/calendar_system/gregorian.py
+++ b/calsocial/calendar_system/gregorian.py
@@ -142,7 +142,8 @@ class GregorianCalendar(CalendarSystem):
 
         return now >= month_start_timestamp and now < month_end_timestamp
 
-    def day_events(self, date, user=None):
+    @staticmethod
+    def day_events(date, user=None):
         from ..models import Event
 
         events = Event.query