How do people dance at a black tie event?

Question:

How do people dance at a black tie event?

I'm going to my first black tie event this weekend in dc with my boyfriend. His dad and stepmom invited us, and there will be congressmen there so its really formal. However, I don't know how to dance. I'm about as graceful as a rock...
What kind of dances do people do at formal events like this? And is there anywhere online to learn them? Thanks

Additional Details

5 months ago
well its a mardi gras celebration, so that might affect the dances I guess! Thanks :)

Best Answer - Chosen by Asker: 5 months ago
well its a mardi gras celebration, so that might affect the dances I guess! Thanks :)