Have your own 8mm. festival at home, buy a couple of campy super 8 movies, a cheap super 8 projector with or without sound and invite all your friends, success guaranteed!
There are many genres to choose frome: horror, zombie, sci-fi, comedy, cartoons and so on. You can also find documentaries or old home movies, which can can be very intriguing. Better: let your audience choose what to show and make sure the program doesn't take too long. Fill a table with your 8mm. collection and let your guests pick which they want to see. Show movies from 2 to max. 10 minutes.
In the old days up to the 1980s, you could hire or buy these films in special stores.
I've got a huge collection of super 8 movies and also some home-movies from the twenties till the eighties. These are often boring... but sometimes you find a gem and you will be flabbergasted what other amateur-film makers choose as subject. I have for example a home movie from around 1970. The former owner was on vacation in I think Austria and only filmed men with enormous mustaches! Close-up! These men obviously think it was strange they were filmed, you can see it on their faces.
....so get that film projector up and running show some super 8 movies!