What type of clubs did you create using the club system?

I really need to make more use of the clubbing system.

For those that use them to fill up Lots, do you find npc groups gathering often?

I tend to make career clubs, as I have some fake career Lots - such as an office for the business career, a cooking Lot for culinary etc- and I have the sims in the same career meet up so they can get to know each other and I can pretend they are at their jobs and get some good screenshots.