Maybe look in to Devil's Point (rock n roll), or Dancin' Bare (home of one of the best signs ever but definitely blue collar). Not too sure of how dive-y those are, or how good for dancers. 

Classic Portland would be Acropolis or Mary's. Though Acropolis is kind of out there in southeast and Mary's is in downtown. Blazer works at Mary's, at least, she used to.

I know Union Jacks is supposed to be really cool. I'm not exactly up to date on the clubs in Portland, but thought I would add those. Someone on here probably know much much more.