Oakland’s biggest bike party is back. Now entering its fourth year, Pedalfest at Jack London Square (Broadway and Embarcadero) brings together a whole range of East Bay biking subcultures. This year, in addition to the festival’s usual thirty-foot-long wooden Whiskeydrome, bicycle stunt shows, and a pedal-powered music stage, there will be a unicycle basketball game and an exhibit from the Exploratorium examining the science behind cycling. Industrial arts training center The Crucible will also host a bike build with some of its artists, and Peter Wagner will once again display his Whymcycles, a collection of handmade bicycles created from recycled materials. For sustenance and libations, hop on a bike to churn out some pedal-powered ice cream or head to the New Belgium Beer Garden. Not content to just entertain, the organizers are also bringing a theft-prevention booth to this year’s festivities, at which cyclists can take a photo of their bicycle and receive a serial number that they can use to file a police report if it’s ever stolen.