Why not have "9 volt battery" night. Invite a few rival mascots (Goldie the Rodent, Bucky BADger, that UMD maroon chicken thingie, the MSU-M steer, Denver's half-eaten jelly donut, etc...) give 'em each a Target vest and call the one with the most bruises the winner!
We could have Schmidt ref it, he's got some free time on his hands.