New Rule: If Bill Maher is in town for one night and you arent at least curious, youre fired. Fans of Mahers TV shows Real Time With Bill Maher on HBO and his old ABC offering Politically Incorrect will get the reference. And if youre unfamiliar with his brand of political sarcasm, pick up a copy of his recently updated book When You Ride Alone, You Still Ride With bin Laden: What the Government Should Be Telling Us to Help Fight the War on Terrorismand Still Isnt. Mahers libertarian politics are all over the map: Pro-choice, antiwar, pro-pot, anti-prudery, and for the most part hilarious. So who will get the all-important Maher endorsement: McCain or Obama? Youll have to catch the show to find out. McCaw Hall, 321 Mercer St., 628-0888, www.ticketmaster.com. $37.50$67.50. 8 p.m.