I dance to anything. Not everyone does. Most people dance to 80s shit, (it is not really dance music so bad dancers don;t feel embarrassed).
Any disco shit.
Start there.
You want stuff that enables people to dance in their usual incompetent style without looking any worse than everybody else. 80s and disco shit will do it.
I'm planning my wedding and I'm putting together a list of songs I want played at the Reception. I really want people to have a great time. What songs make you get up and dance? Are there any songs you'd be pleasantly surprised to hear at a wedding?
These don't need to be the traditional songs...this is going to be a laid-back affair.