Harry Potter. It’s a good movie, everyone know about it. It has some family friendly themes, with some action, romance, fantasy, and since people know about it it’s easy to immerse yourself in the story or just pick up if you miss a part (for bathroom or kitchen breaks) it’s fun to watch sober or high.
I’m gonna go off the beaten path a little here and go with Jonathan Demme’s “Something Wild”, chances are the guests haven’t seen it and that film is one helluva ride, it’s got a little bit of something for everyone - comedy, romance, thriller, you name it.