The Foster City Art & Wine Festival is a fun, famiily-friendly home-town event. Look for traditional offerings (like art and wine and entertainment, fire truck, ambulance etc.), and the kids' favorite, the popular carnival area, with rides for kid/teens/adults.
The festival is June 4th to 5th. The booths shut down earlier than the rides, in case you planned to do some late-night shopping.
Saturday June 4 - 10 a.m. to 11 p.m.
Sunday June 5 - 10 a.m. to 5 p.m.
Parking is free at Parkside Towers (exit 92 at Foster City Blvd, and follow the signs). The festival is next to the lagoon at Leo Ryan Park (corner of E. Hillsdale and Shell Blvd.)