diff --git a/reservations/tasks/sync_google_calendar.py b/reservations/tasks/sync_google_calendar.py
index 6af498d..1281cf0 100644
--- a/reservations/tasks/sync_google_calendar.py
+++ b/reservations/tasks/sync_google_calendar.py
@@ -63,6 +63,45 @@ def insert_calendar_event(service, resource: Resource, reservation: Reservation)
     reservation.save()
 
 
+def insert_or_update_calendar_event(
+    service, resource: Resource, reservation: Reservation
+):
+    if not reservation.google_calendar_event_id:
+        logger.info(
+            "Event in database has no Google Calendar event ID: inserting | %s",
+            reservation.google_calendar_event_id,
+        )
+        insert_calendar_event(service, resource, reservation)
+
+    else:
+        # this event was in Google Calendar at some point (possibly for a different
+        # resource/calendar), but did not appear in list(). Try to update it, then
+        # fall back to insert
+        logger.info(
+            "Reservation with event id not in Google Calendar: trying update | %s",
+            reservation.google_calendar_event_id,
+        )
+        try:
+            event = (
+                service.events()
+                .get(
+                    calendarId=resource.google_calendar,
+                    eventId=reservation.google_calendar_event_id,
+                )
+                .execute()
+            )
+            update_calendar_event(service, resource, event, reservation)
+        except HttpError as error:
+            if error.status_code == HTTPStatus.NOT_FOUND:
+                logger.info(
+                    "Event in database not in Google Calendar: inserting | %s",
+                    reservation.google_calendar_event_id,
+                )
+                insert_calendar_event(service, resource, reservation)
+            else:
+                raise
+
+
 def sync_resource_from_google_calendar(
     service, resource: Resource, now: datetime
 ) -> set[str]:
@@ -129,54 +168,31 @@ def sync_resource_from_google_calendar(
     return {event["id"] for event in events}
 
 
+def sync_reservation_from_database(service, reservation: Reservation):
+    for resource in reservation.resources.all():
+        insert_or_update_calendar_event(service, resource, reservation)
+
+
 def sync_resource_from_database(
     service, resource: Resource, now: datetime, existing_event_ids: set[str]
 ):
-    reservations = resource.reservation_set.filter(end__gt=now).select_subclasses()
+    reservations = (
+        resource.reservation_set.filter(end__gt=now)
+        # skip events we already pulled from Google Calendar during this sync
+        .exclude(google_calendar_event_id__in=existing_event_ids)
+        .select_subclasses()
+    )
     # TODO: this could probably be more efficient?
     for reservation in reservations:
-        if not reservation.google_calendar_event_id:
+        if isinstance(reservation, ExternalReservation):
             logger.info(
-                "Event in database has no Google Calendar event ID: inserting | %s",
+                "External event in database did not exist in future of Google Calendar: deleting locally | %s",
                 reservation.google_calendar_event_id,
             )
-            insert_calendar_event(service, resource, reservation)
+            reservation.delete()
 
-        # reservation has an event id, so check if we already handled it earlier
-        elif reservation.google_calendar_event_id not in existing_event_ids:
-            if isinstance(reservation, ExternalReservation):
-                logger.info(
-                    "External event in database did not exist in future of Google Calendar: deleting locally | %s",
-                    reservation.google_calendar_event_id,
-                )
-                reservation.delete()
-            else:
-                # this event was in Google Calendar at some point (possibly for a different
-                # resource/calendar), but did not appear in list(). Try to update it, then
-                # fall back to insert
-                logger.info(
-                    "Reservation with event id not in Google Calendar: trying update | %s",
-                    reservation.google_calendar_event_id,
-                )
-                try:
-                    event = (
-                        service.events()
-                        .get(
-                            calendarId=resource.google_calendar,
-                            eventId=reservation.google_calendar_event_id,
-                        )
-                        .execute()
-                    )
-                    update_calendar_event(service, resource, event, reservation)
-                except HttpError as error:
-                    if error.status_code == HTTPStatus.NOT_FOUND:
-                        logger.info(
-                            "Event in database not in Google Calendar: inserting | %s",
-                            reservation.google_calendar_event_id,
-                        )
-                        insert_calendar_event(service, resource, reservation)
-                    else:
-                        raise
+        else:
+            insert_or_update_calendar_event(service, resource, reservation)
 
 
 def sync_resource(service, resource: Resource, now: datetime):