Do it yourself tattoo's. Then you can have health day with free tetanus shots.
Bullcrud Bingo - make bingo cards with all the trendy words. they can take them to the next meeting and when you get Bingo you stand up and yell BullCRUD ! Words like; outcomes, quality measures, synthesis, etc.
I saw an art event where people did a progressive painting. One person did the head, folded the paper passed it on next person did torso etc. it was done as a round robin and you got your "head" back.