I have clubs based on age: elders, children, and teens.
I have clubs for specific purposes: a club for people to get together for spiritual text study, a club to recreate a famous musical group.
I have a club for developing a skill: a club for playing chess.
I have clubs for families to get together.
I have a club for geeks to get together and watch sci-fi movies.
I have clubs for Star Trek and Star Trek TNG crew members.
I have a club for ecologically minded people to hang out together.
I have a club for coworkers to hang out together.
I have a club for slackers to jam together.
I have a club for actors to socialize and practice together.