Make and put on the door - Teach-A-Roo: Ticket Out the Door! This can be used as an exit ticket. You could put critical thinking or math on the door. This gives the students something to do when waiting at the door.
Topper to cut and minis to serve. this idea is mindblowing :-) What about vintage decorated mini-cakes instead of cupcakes? As long as there's enough for everyone. Put cupcakes on table around cake & mini-cakes? Yep loving that idea!