Hi,
My name is Paul, and I recently stumbled upon this forum. I've been doing backyard outdoor movies for more than 10 years now. I'm running 16mm film, which adds a great deal more fun to the shows, including the opportunity to show some really obscure material.
Here are some photos from a couple of years ago.

This is the screen, the film hasn't started yet.

The projector is in the open second story window. No problem with people's heads getting in the way!

Here are people sitting down to watch the first short subject.

This is a view inside the "booth". The projector is a Hokushin X-500, which I believe was made in the early 1970s.