The San Francisco Arts Commission’s Street Artists Licensing Program will mark 40 years of providing locals and tourists with colorful outdoor marketplaces and a significant contribution to the economic life of the City. The celebration will kick off on Saturday, June 30, 2012 from 10 am to 4 pm at Justin Herman Plaza featuring live music, remarks by city officials, and the opportunity for the public to enjoy the handcrafted objects created by the street artists at one of their premiere sites.