Hi! We used to have a [Club] tag, but it was removed since it wasn't used very much - what sort of ideas did you have for the club? If it'll be different enough from regular game/franchise discussion threads, I'd be more than happy to bring the tag back. :)
Examples of old clubs I can remember here that did differentiate themselves enough from regular game threads were this and this, with sign-ups, designated topics and even their own events sometimes, however the activity level of PC as a whole back when those clubs were popular is very different from now so I'm not sure how feasible something like this would be, but like I said, if that's what you had in mind, I'd love to try as well.
Otherwise, we do have threads like this and this where people who love the game(s) just discuss it together, which is kind of like a club but without labeling it so.