Would this be a good place to ask about suggesting a new contest? If it isn't you can always move this! I've looked, and so far this is the best place to ask.
SO. I was thinking, besides the Cosplay Contest, there could be a Walk-on Tournament! Pardon me on the rules, please, what since I'm pulling these off the top of my head... But basically, it would be that two people would face off and take turns doing small one-person skits off the tops of their heads. The winner of a round would be determined by a panel of judges, and the people competing can involve people from the audience if need be. The people facing off would be allowed to do whatever they want for a skit (short of full-frontal nudity or anything else banned by the Cosplay Contest rules), including preparing skits beforehand so as to put more thought into the things they do.
The entire tournament would be arranged into a tournament tree, and there would be a set number of spaces that can be filled. Of course, you would have to register to be in it beforehand. But it would be completely off the top of your head, and it would encourage all sorts of creativity and... Stuff!
Hell, I don't know. I just want to do something like this really freaking badly.