Coulson will be there and is a decent dancer. he's promised Jemma & Skye dances, but is open the resto of the time. And is interested in the history.
Ianto will be there being slightly awkward. He's an okay dancer, but he's still not at 100% on his leg, so he'll probably be sitting on the sidelines for part of the night.
Jim Kirk will be there dancing and flirting up a storm.