How about this, instead of running it like a contest, change it up a bit.
Just ask people to just submit their films, and the you'll host the show with them, review the film, and have them talk about their work.
The difference would be that you'd be doing it for most everybody, (Or those that submit their film at least) and it wouldn't have the stigma of a contest with no prizes or creativity. It'll just be a call out asking if people want some more publicity to would enjoy talking about themselves for a little bit. (People tend to like talking about themselves you know)
You can still go through and only pick those you like, but I think that way will be more fun all the way around.
In other words, don't call it a contest, but a submission process. Don't say "First/Second/Third Place" but contact those that you like and interview them.