The Atlanta Film Festival is coming up this weekend -- you can connect with filmmakers there. atlantafilmfestival.com
Also, I highly recommend the weekly “Film Bar Monday” meet ups as a good place to connect.
The suitability of a festival for your film goes a lot deeper than the mere fact that your film is a short. I’m not dismissing the question (see below), but I want you to internalize the idea that creating a festival strategy is about figuring out who you are and who the people in your audience are, and then researching which festivals they go to.
The broad answer to your question has a few different points:
1. Oscar-qualifying fests almost always have more expansive shorts programs than non-qualifying. See the list here: http://www.oscars.org/sites/default/files/87aa_shorts_festival_list-.pdf
The caveat to this is that competition at these fests is incredibly high. The Oscar-qualifying Atlanta Film Festival, where I work, routinely gets 2000+ short film submissions with room to program ~150 films each year.
2. Festivals that focus on shorts exclusively are also more welcoming of short films of a wider variety, because that’s all they do. Competition is somewhat less fierce at these fests and they tend to be less prestigious and get less attention overall. Not that that’s bad, necessarily — but it may be an important factor depending on your goals.
3. The list of “best” festivals for short films looks remarkably similar to the list of best festivals overall (which goes back to my initial point that you should be submitting to festivals that will be friendly to your individual film, not just “short films” in general.
So how to start work on a festival strategy that takes your film’s attributes into account?
I’ve written a LOT about that topic, in one article in particular — you can check it out here: http://filmfestivalsecrets.com/ffs/2009/05/festival-exercise-define-your...
There’s a lot of thinking to do around film festivals, and it looks like you’re early on in your filmmaking journey. It’s good to be thinking about these things now while you can still make changes.