There are two events of interest to Muni this weekend: Critical Mass tonight at 6, and Supercross Saturday at one of the baseball parks. Both events are dedicated to the elimination of automobiles, but only one will actually accomplish its goal, while the other will just be a noisy, irritating echo chamber. Muni will be running extra trains to accommodate the Supercross crowd. The extra trains will stop running at 10pm, which is a......

Mayor Gavin Newsom says that one of his "top priorities is to ensure that every San Franciscan has a safe and happy New Year. Riding Muni is a smart and green way to ring in the new year." (Thanks, Gavin!) And with a firm flick of his wrist, this New Year's Eve, starting at 8 p.m., Muni will be free all night, which is about what it's worth. The free rides come to a......

-- Tegan & Sara: identical twins cum awesome rock songstresses with questionable haircuts play tonight in the Mission. Show starts at 8 p.m., Brava Theater, 2789 24th St.; tickets are $25. -- Arj Barker & Friends: Local comedian and co-writer of the Marijuana-Logues, plus a slew of special guests, perform tonight. 8 p.m. at the Punchline, 444 Battery; admission is a mere $10. -- Chromeo: Oh-so zany electrofunk duo break your illusions of nothing-to-do......

Our security guy returns this week with a post about the measure taken before a big event as well as some more answers to recently posed questions. ...