Am living in Venice which means ideally there is something around Venice / Santa Monica / West LA / Marina Del Rey... Thanks in advance!
It might help if you also look for "hustle " and "swing" dancing. I never got very far asking for "rock" dancing and I've found that hustle is basically the same.
Swing can be very different -- I found myself in a West Coast swing event and had no clue what to do with myself. So just be prepared for surprises. :)