Blues dancing is the closest high I've experienced to performing music, and Do Something Blue is where I learned to blues dance.
The people usually don't limit themselves to cliques.  You can typically ask anyone  to dance and they'll say yes at least once.  This makes for a fantastically friendly and positive atmosphere.  As a relatively amateur lead, I can say you will find at least one follow that really gets into the dance at your exact wavelength (unless you're sleazy or something).
Some folks are great friends with each other and will put on fantastic, joking dances intermittently. Â All-around great time if you truly love music, even as someone that goes to these alone!