Method e.commit() in both DayPilot.Calendar.events.update() and DayPilot.Month.events.update() is not implemented.
Methods DayPilot.Calendar.events.find() and DayPilot.Month.events.find() are not implemented, either. But these issue is minor as I can iterate DayPilot.Calendar.events.list and DayPilot.Month.events.list to get the desired results.