Hollow Earth Radio, Seattle's best free-form broadcaster (meaning: DJs improvising without restrictive playlists), is holding a month-long fundraiser disguised as a festival. They've been putting on shows in DIY venues all over Seattle. Tonight—in a warehouse in Ballard—is the final night, with the best lineup: Calvin Johnson, Bow + Arrow, Beep Family Orchestra, Your Heart Breaks (with a full band), and more. (5113 Russell Ave NW, www.hollowearthradio.com. 7 pm, $8, all ages.)