How am I suppose to dance at a 'formal' dance?

A girl asked me to dance, and I'm terrible at dancing. Apparently it's 'formal', but people still grind anyway. However, I doubt this girl dances that way. With that in my mind, I really don't know how I should dance. I don't want her just sitting down the whole time at the dance you know? I mean sure we'll slow dance and do the dances where the songs tell you what to do, but what about the other 200 songs =/. Suggestions?How am I suppose to dance at a 'formal' dance?
Don't assume she won't grind, I've been surprised a few times.



Otherwise I'm assuming formal doesn't mean actual ballroom dances (waltz, swing, tango,etc) that you have to know the step to. As long as you're bouncing to the beat AND (and I mean AND) making some sort of physical contact, you should be fine. You have to get yourself to do it, it is fun, hold hands or SOMETHING while you dance.How am I suppose to dance at a 'formal' dance?
You could try not to be too stiff and learn how to move with the beat.