the only advise I can give you is to enter your film into as many film festivals as possible. Most film festivals, receive hundreds if not thousands of entrys, that a the festival board has to sort through and decide which ones should be shown to the public. So my advise is just that keep submitting and submitting your film into film festivals, one of them is bound to show it to the public.
I'm from Orlando, Florida and every year here, usually in May, there is a film festival, in its 13th year this year, called the
Brouhaha Film Festival. I've never been to it, but from what i've heard and read about it, they show some pretty over the top films. Also if your film is a short, keep it between 8-10 mins.
Also besure to find out what format your film needs to be on, it could be different from festival to festival.
hope your film works out...
by the way check out my two sites, i'm also working on a horror short that i hope to submit to festivals...
Projection Films
The Day I Became a Vampire