Hmm... Do you want people to sign up, or for them to just post and have one of us judge them? I just need to know, because this is technically a contest, and those people usually sign up for.
But how should it be run... hmm... well, if you're willing, we can score out of forty(10 for each judge), and the highest ones can move up until there's only one comedian. But, the only problem I see with that is not everyone can judge at the same time.
That's my first suggestion on how people move up and how we find a winner. I'll have more soon, if this way doesn't work out.