I've entered this film festival a few times, and it is such a brilliant experience! It's based in Basingstoke, UK, so for those of you outside the UK, it maybe a little troublesome to attend! They only show the films of attending film makers. It's a great experience as they do a Q&A with each film maker after their film is shown and sometimes open up questions from the audience. Loads of film makers go, so it's a great place to network. Thoroughly recommended!
http://www.redcarpetscreenings.com