Update local calendar to process calendar events in the executor (#144233)

homeassistant/components/local_calendar/calendar.py

@@ -89,20 +89,27 @@ class LocalCalendarEntity(CalendarEntity):
         self, hass: HomeAssistant, start_date: datetime, end_date: datetime
     ) -> list[CalendarEvent]:
         """Get all events in a specific time frame."""
+
+        def events_in_range() -> list[CalendarEvent]:
             events = self._calendar.timeline_tz(start_date.tzinfo).overlapping(
                 start_date,
                 end_date,
             )
             return [_get_calendar_event(event) for event in events]
 
+        return await self.hass.async_add_executor_job(events_in_range)
+
     async def async_update(self) -> None:
         """Update entity state with the next upcoming event."""
+
+        def next_event() -> CalendarEvent | None:
             now = dt_util.now()
             events = self._calendar.timeline_tz(now.tzinfo).active_after(now)
             if event := next(events, None):
-            self._event = _get_calendar_event(event)
-        else:
-            self._event = None
+                return _get_calendar_event(event)
+            return None
+
+        self._event = await self.hass.async_add_executor_job(next_event)
 
     async def _async_store(self) -> None:
         """Persist the calendar to disk."""