Diana Gameros

Mariachi Flor de Toloache opens the 2018 Yerba Buena Gardens Festival -- dozens of free outdoor shows May through October -- at 1 p.m. May 6. (Courtesy Andrei Averbuch)

Free Yerba Buena Gardens fest kicks off with mariachi

It’s time for the 2018 Yerba Buena Gardens Festival, and that means…