I'm in a bunch of different college clubs while secretly not being a college student.
I am in several different college clubs on my campus. I am in a computer science club, a pickleball club, I even help with making films and editing videos for the film club. But I have one secret that nobody on campus knows about. I'm not actually a college student. I have been doing this for 2 years and nobody has found out.
It's actually pretty easy to get away with. All you have to do is go on google and type in "clubs at (name of your college)" and your college will typically have a page with a list of clubs. Once you've found a club you like, find them on Instagram and then message them about when and where the club meets. Once you're at the club, nobody asks for your student ID and you're just assumed to be a student.
The reason I did it was because I live in a city with a very big college that has hundreds of ways to get involved. But once you're out of college, the things to do falls off a cliff. I wanted a way to meet people, make friends, and do things that I enjoy.