The day is named for Grateful Dead founder Jerry Garcia, an Excelsior District native son who lived his early years on Amazon Avenue, not far from McLaren Park.
Today, the park's amphitheater is named after the legendary musician/counter-culture guru who died in 1995. Sunday would have marked his 68th birthday.
Jerry Day -- put on by the Excelsior Cultural Group and the San Francisco Parks Trust -- celebrates Garcia and the neighborhood. In addition to live bands, there'll be food and arts and crafts for sale. Admission is free, but organizers welcome donations to help pay for the only-in-San Francisco event.