FREE-WHEELING: Get ready to rumble, kids: the Gotham Girls All Stars take on (read: crush!) rivals the Boston Massacre at the Roller Derby Season Opener.Long Island University's Schwartz Athletic Center in Brooklyn. Saturday, 7:30PM.
DIP: If you've ever been intrigued by Argentine tango, or if you saw that terrible Richard Gere remake of that genius Japanese movie Shall We Dance and have been jonesing to take a dance class ever since, TriANGulO -- which has been featured in everything from The Economist to Vogue -- is offering free beginner's classes. Saturday and Sunday, schedule varies.
DELICATES: Weather the recession with fabulous underthings. Mott Street's Mixona boutique is slashing its prices (this weekend only!) by up to 70 percent, meaning skivvies, sleepwear and swimsuits from the likes of D&G and La Perla can be yours for a (relative) song. Saturday and Sunday, 11AM-7:30PM.
CRAZY CAT: Gato Loco plays Cuban son sounds from the 1920s, '30s and '40s, which should make for a very sexy evening (at Brooklyn's Barbes). Plus, how often do you get to be in a room with congas? Saturday, 8PM.
RETROVE: East 7th Street's Amarcord Vintage Outlet has had a die-hard following by the city's most stylish thrifters. This weekend is its last, meaning you can scoop up crazy bargains -- as in, great pieces for $5 and $10 and $20 -- before the doors close for good. Saturday and Sunday, hours vary.
BROOKLYN MUSEUM: Part of the miamiHeights documentary series, miamiHeights:Hernan Bas follows the skyrocketing career of artist Hernan Bas, from his first major show at the Rubell Family Collection during 2007's Art Basel Miami Beach to his opening at the Brooklyn museum just one year later.