Is there a BeforeAppointmentsMoved event for the WeekView? I see it in the DayView, but can't seem to find a suitable event in the week view.
No, UltraWeekView and UltraMonthViewSingle do not expose any such event. If you like you can submit a feature request for this.
Do you have a suggestion on how I can prevent users from moving appointments in these views or a way to cancel them if they do?