Time for the Enchantment Under the Sea Dance!

The Winter Dance Celebrates "Gold." American Museum of Natural History, Central Park W., nr. 79th St., 7:30 p.m. Hundreds of young rich people — including our pals Tinsley Mortimer and Fabiola Beracasa — will dine in the Grand Gallery and then have dessert and dance under the blue whale in the Milstein Hall of Ocean Life. It's socialite prom!

Milk Salon opening. 450 W. 15th St., nr. Ninth Ave., 8 p.m. Chef David Bouley will prepare a tasting menu for fashion folk like Zac Posen, Francisco Costa, Jessica Stam, Alice Temperley, and others. It's actually a post–Fashion Week eating competition. Jessica's Stam's competitive-eating-scene name is "Feral Cat."

Or check out our Agenda listings for tonight, selected by New York's culture editors.