For five dollars (zilch if you're a museum member), you can drink from a well-stocked open bar, pick at tasty hors d'oeuvres (e.g., chicken satay and prosciutto-wrapped melon) proffered by roving waiters, take in live music or a DJ, and chat with artsy people. As if that weren't enough of a draw, the event, which goes down the third Thursday of the month from 5:00 to 8:30 p.m., is held on the breezy Philip Johnson-designed plaza outside the museum. It's one of the best deals in town.