Come out of your shell.

EAT
Urban Lobster
What: Crab cakes! Chowders! Mussels!
Why: Bisque in the glory of lobster rolls delivered to your desk.
When: Now’s the tide.
Where: 240 E. Houston St., at Ave. A (212-677-2626).

Spain’s 10
What: Food and wine demos and tastings from Espana’s most innovative chefs (Adrià, Berasategui, and more).
Why: Pricey. But cheaper than airfare to Madrid.
When: Sat., 8 a.m.-7 p.m.
Where: Guastavino’s, 409 E. 59th St., at First Ave. Tickets at 877-772-4610 or spains-10.com.

DO
My Dog Loves Central Park Country Fair
What: Agility courses, musical chairs, spoon races, adoptions, and flirting — on the leash.
Why: Doggone it’s fun.
When: Sat., 11 a.m.-4 p.m.
Where: Central Park, 72nd St., b/t the Bandshell & Sheep Meadow.

GIVE
Halloween Really Really Free Market
What: Open-air, open-ended bazaar. Set up a booth to swap clothes, make art, and give stuff away.
Why: Sharing is caring/dancing/eating/entertaining.
When: Sat., noon-dusk.
Where: St. Marks Church, Second Ave., at 10th St. More information at inourhearts@gmail.com.

HEAR
Swing Club Series
What: Jazz at Lincoln Center’s new membership series kicks off with mambo beats.
Why: It don’t mean a thing if it ain’t got prime seats and private cocktail receptions.
When: First session, Fri.; cocktail reception, 7 p.m.; show, 8 p.m.
Where: Info at 212-258-9824 or online at jalc.org.