Hi there,
We work with Movie Licensing USA. We offer a free Family Movie Night kit that gives you all sorts of information on how to plan this event as well as information on the licensing process.
(Oh, and the comment above about not charging admission and therefore not paying for a license is correct..You would still need a license to show the movie.)
You'd need to get in touch with Movie Licensing USA at 1-877-321-1300. I'd recommend you download our fee Family Movie Night Kit. It has all the information you'd need, not only on licensing, but it has great ideas for doing a movie night.