Honestly maybe just a little area where people can set up in general might also be good. That way, people can sign up for the variety show and/or have their own little area for a longer show. (Strongwoman Magne will be adorable, and a variety show act is too short for everyone's cool stuff.)

Oh right I was thinking auction instead of raffle for some reason, but typed raffle, which is honestly the better one to do. Get X number of tickets, put them in what you want. Easy peasy