This article comes to us courtesy of SF Station.
By Matt Crawford
Amateur pilots test their wings this weekend with Red Bull's Flugtag, featuring 36 teams launching themselves above McCovey Cove in makeshift aircrafts. The San Francisco Green Festival is hooking bicyclists up with free admission and Push the Feeling starts the weekend with a DJ party, free before 10pm. In the nearly free category, KUSF lives on with its annual Rock Swap.