A head-spinning array of performers, including the Black Crowes, Mos Def, Ween, Loretta Lynn, and Taj Mahal, are confirmed to appear Seattle's 31st annual Bumbershoot festival, taking place Aug. 31-Sept. 3 at the 74-acre Seattle Center. The event kicks off Aug. 31 with the Hip-Hop 101 showcase, featuring Mos Def, Dilated Peoples, and Jurassic 5.