924 Gilman will host the fourth Musicians and DIY Electronics Swap Meet on Sunday, Feb. 20. It's basically a gathering a geeky musicians looking to geek out some more over gear. Judging from photos of the last event, everything from Speak & Spells to guitars were being peddled. Those looking to sell should arrive by 10 a.m.; space is first-come, first-served, and the fee is $15. Organizers say: "suggested items to bring for sell or trade include musical instruments, amplifiers, electronic parts and supplies, electronic assembly tools, technical books, electronic test gear, electronic kits, etc." 924 Gilman St., Berkeley. 11 a.m.-3 p.m.