Every year, Davis radio station KDVS holds a record swap where local record labels, record collectors and record stores can trade thousands of records. It's likely that a few CDs, T-shirts and turntables will turn up as well. This year's event will be held Saturday in Luigi's Fun Garden, and music nerds, casual shoppers and passersby can get in for $3. From 9 a.m. to 2 p.m. people will be able to visit booths of more than a dozen vendors, including punk-rock labels Gearhead and Prank Records. KDVS, Midtown Monthly and the 'Zine Symposium held July 11 will also have tables, according to event co-coordinator Heather Klinger. Also a DJ at KDVS, she's been coordinating the event with Tim Mat