CONCERT Love Her? Hate Her? We Haven't Decided We're talking about Lady Sovereign, the diminutive British emcee who's been the next big thing for ages now and sounds a hot-pink shade that's not unlike the Streets and M.I.A. We'll reserve true judgment on her music, though, till we catch her tonight, when she makes a D.C. stop. It's an early show, which is a shame, because she's got late-night vibe. $15. Doors open at 5:30 p.m. 9:30 club, 815 V St. NW. 800-955-5566.
THE SCENE Nightmare on M Street Returns The seventh edition of this downtown Halloween party begins at 6 p.m. today, and makes you eligible for drink specials and allows you to skip cover at Five, Ozio, Andalu, MCCXXIII and other bars around M Street and Connecticut Avenue NW. Here are the rules: Register at Rumors (1900 M St. NW) or the Front Page (1333 New Hampshire Ave. NW) till 11 p.m. (we suggest the latter for purely stuck-up reasons); you wear a costume, it's $15; you don't, it's $20. Obviously, you should be at least 21. 6 p.m.-2 a.m. 301-652-7712.
CLOSING "Red Light Winter" To those of you who'd planned to catch this Studio Theatre production of Adam Rapp's mouthy play, tonight and tomorrow constitute your very last chance. Our word of caution, if you haven't heard: The play, which follows two frenemies and an intriguing love interest from Amsterdam to New York, has some nudity of the full-frontal persuasion. Today at 2 and 8 p.m.; tomorrow at 2 and 7 p.m. $34-$42. 14th and P streets NW. 202-332-3300.
EXHIBIT Looking Into "The Heart of DC" We spied a few big local names, including Sam Gilliam, William Christenberry and Jiha Moon, among the 100 artists whose works have been acquired by the District for the John A. Wilson Building's very own collection of art. The 175 pieces, amassed this year in what officials say is only the first phase of the collection, will be unveiled Tuesday in their new home during a reception, with hors d'oeuvres and music by the Duke Ellington School of the Arts Jazz Combo. Free, but ID required. 5-7 p.m. (After the opening, the works can be seen weekdays 9 a.m.-5 p.m.) 1350 Pennsylvania Ave. NW. RSVP to 202-724-2042.
FESTIVALS "Beyond the Waltz" There's something beyond the waltz? We had no idea. But the Austrian Cultural Forum will host a dance festival that looks at contemporary Austrian choreography beginning Tuesday with "Hanna Berger: Retouchings." The program is a U.S. premiere of new interpretations of the work of Berger, the late Austrian expressionist dancer who survived a concentration camp. Free but RSVP required. 7:30 p.m. American University's Greenberg Theatre, 4200 Wisconsin Ave. NW. 202-895-6776 or http:/