Roster Double-ups

By default, the system warns but does not prevent people from being rostered twice at once to an event. If you wish, you can prevent this from happening entirely, which means the system won't allow someone from being rostered at all if they're already rostered elsewhere at the same time.

It will still allow someone to be 'Withdrawn', or 'Contacted' for an event whilst attending another event on the same dates, but ensures a person isn't set to 'Tentative', 'Attending', or 'Attended' for more than one event at a time.