Cucalorus Film Festival, reg d. June 22
Cucalorus is not an animation-specific festival, but don't let that stop you from submitting. This non-competition festival (occurring in November) famously helps pay for travel for all accepted filmmakers, regardless of film category or film length. Once you get there you will be treated to 4 days of non-stop parties and food, and meeting filmmakers from all over the world. Don't miss this one!
Regular deadline is June 22nd and late deadline is July 27th (cheaper if you submit early).