The get together clubs should have a world resident requirment
I wish there was a requirement so I could have clubs that only accept sims that live in a certain world. So that I could make certain venues have sims that live in the world hanging out there and etc....
This is a problem of the game itself. I think sims should stay in their assigned worlds unless we tell them to go to another one. I hate seeing the Goths walking in Sulani or the Calientes working in a San Myshuno stall.