Christians are right about one thing when it comes to atheists: We can be obnoxious when we confront believers. Usually, being a good atheist means quietly affirming your disbelief and demonstrating atheism's worth by example. But not tonight. Leading atheist rabble-rouser Richard Dawkins reads from his newest book, The Greatest Show on Earth: The Evidence for Evolution. It soundly refutes the dumb Christian argument that evolution is "just a theory." Tonight, let your unbeliever freak flag fly and celebrate your godlessness. (Hec Edmundson Pavilion, 3870 Montlake Blvd NE, 634-3400. 7:30 pm, free.)