a ridiculous monster Prom/ every musical ever crossover

one time I randomly came up with the idea to make a crossover between Heathers, Be More Chill, Dear Evan Hansen, Mean Girls, Beetlejuice, Hamilton, and Monster Prom (just to clarify I'm putting all of the musical characters into the Monster Prom universe and not Monster Prom characters in one of the musicals' universes). feel free to leave suggestions for monster-sonas and wacky scenarios :3
I already came up with a few ideas in a group chat with my friends, but I thought it would be fun to add some of your ideas to this story so we could all enjoy an epic and absurd crossover au between Monster Prom and all of our favorite musicals. this au is somewhere between post-canon and a completely different timeline altogether, just wanted to make that clear. anyways, have fun :)