createEvent method
Creates a new calendar event.
Implementation
@override
Future<CalendarMonthEvent> createEvent(CalendarMonthEvent event) async {
await Future.delayed(
const Duration(milliseconds: 500)); // Simulate network delay
final newEvent = event.copyWith(id: DateTime.now().toIso8601String());
allDummyEvents.add(newEvent);
return newEvent;
}