Cut the rug to the happy-go-lucky sounds of Baltimore’s Sac Au Lait, a traditional New Orleans Dixieland ensemble that can rip it, sass it or just lay it back. Can’t dance, or want to hone your chops? We’ve got master classes all afternoon, and a beginners’ one at 8pm. Don’t have a partner, or don’t like your current one? Dance hosts wear buttons and are happy to dance with anyone—plus everyone gets to switch in the “snowball dance jams.” No special shoes required.