When I Grow Up from Matilda. My seniors sang it a few years ago at our final cabaret and everyone was in tears. (Maybe not as dancey as you wanted.)
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.
Joe Iconis' "The Goodbye Song" is a great one for these kinds of occasions. Wonderful balance between ballad and uptempo, plenty of time for jamming and dancing at the chorus and outro, can easily be divided for solos, and accessible to a wide skill range for performing.