Most rinks have Friday and Saturday publics. There's sometimes a DJ, but mostly it's just loud pop/rock/rap/whatever music with (usually) lowered lights, and (sometimes) something like a disco ball.
What the rink makes it sound like in their ads:
What it's really like
Just in case you're wondering if it's worth going to for practice: probably not. Take your girl/boyfriend and squeal and grab her/him a lot. You'll fit right in.