I have a nightclub that I've built in my game that holds 3 clubs. I have the more icons mod by Zerbu so that enabled me to get a lot more inspiration flowing which is great.
I have a club (slash 'gang') that are pretty much hardknocks/bullies (unlike Max Villareal's club as I don't like my sims breaking everything!) that tend to hog the bar and I've built a makeshift fighting ring for them to use as they mostly spend their time getting into fights, drinking, using the dart board/card table (no harm in a bit of sneaky bets!) - and they bring their dogs now which is a pretty cool feature! Lots of pitties/dobermans/etc about.
One of the other clubs that reside there are fans of comedy, I do a stand-up night with Johnny Zest and another guest entertainer on Tuesdays and Saturdays and this club are always there. Obviously with the club activity to watch live entertainment. Always nicely filling up the tables!
The last club I've built an exclusive hangout for underneath the nightclub and they're hackers/programmers on the side of mischief, so while they occasionally socialise up in the bar, they're usually filling out the empty computer chairs downstairs getting up to no good.
The club feature went from unused to now one of my all-time favourite features pretty quickly. :D