Bottomless! Pants Off Dance Off

Hiking through subway stations and fifth-floor walk-ups gives New Yorkers an edge in the booty department, and this party invites you to show off the natural splendor of your behind. Leave your trousers at the free pants check, and get to grooving with other underwear-clad revelers. You can even buy some glam skivvies from the panty boutique, or get your caboose decorated at the butt-jazzling studio. If you’re feeling particularly game, head to the spank station to achieve a red glow on your behind. All bums are welcome.