There are a number of places in the Anaheim area to dance... but the best, IMO, is Memories, off the 91 at Tustin Ave. East Coast/Lindy on Monday, Thursday, Friday, Saturday night. West Coast on Sunday, and ballroom Saturday evening (6-8, I think).
Also, there's the Sky Room in Long Beach, a marvelous restaurant with live music and a small, but comfortable dance floor.