If you have an event that uses classes for signups, then switch to using role-based signups, the list of people who signed up is no longer visible but the signups are "remembered" - that is, if I wanted to, I could switch back to class-based signups and everything would be there like I hadn't done anything at all.

Would this work in reverse?

If I have role-based signups, can I switch to class-based then back again without losing anything?

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Ieyasu - Organizer, Ex Cineribus