Ballroom dancers
A ballroom dance was a form of dancing which Data, in his quest to be more Human, wanted to learn. (PIC: "Nepenthe")
In 2381, Captain Carol Freeman postponed a ballroom dance competition on the USS Cerritos as all hands were required to assist in the rescue of the USS Archimedes. Ensign Wendy, who was a participant in the competition, was visibly upset at the cancellation. (LD: "First First Contact")