It's a bluegrass, LoveFest, Litquake kind of weekend. So while you're kicking back and letting the best of the English language wash over you, make room in your head for another voice. For the first time in San Francisco, Improv Everywhere is asking anyone who's available at 2 p.m. on Saturday to meet in Dolores Park for The MP3 Experiment. In this quirky urban adventure that is one part guerrilla performance art and two parts silly, an omniscient narrator asks hundreds of people to download the same soundbite, wear the same colors, and the bring the same props for a jolly bit of flash-mob random. If you're an all-work sort, SuperHappyDevHouse 27 is having another Saturday session at Google's San Francisco offices at 2 p.m. The Affiliate Marketers meetup will be at the Golden Gate Perk Internet Cafe at the same time chatting about what else—making money online. And, oh yes, those layoffs you may have heard about at Valleywag? We'll be drowning our nostalgia at Joey & Eddie's, the bar formerly known as Moose's, tonight at 5 p.m.