Before hitting the sundry of top-notch hilarity littering San Francisco during the 7th Annual SF Sketchfest - i.e., the sad clowns making funny - be sure to stop by tonight's opening party. No really, it's well worth the price of admission. And then some. They have Aimee Mann, Kristen Schaal (aka the girl from Flight of the Conchords), Paul F. Tompkins, Todd Barry, Rhys Darby, and DJs Skip & Shindog on-hand to perform. Plus,......