Sets the title for the currently opened event.
- The calendar event must be previously opened with C_Calendar.OpenEvent or an event candidate from C_Calendar.CreatePlayerEvent and similar.
- The calendar event is updated with C_Calendar.UpdateEvent or created with C_Calendar.AddEvent.
- Patch 8.0.1 (2018-07-17): Moved to C_Calendar.EventSetTitle.
- Patch 3.0.2 (2008-10-14): Added as CalendarEventSetTitle.