Check out one food stall that supports a special cause.

Everyone hits the Ferry Building Farmers’ Market on Saturday mornings for its endless array of scrumptious surprises. But the stand for La Cocina Community Kitchen (right next to the ever-popular Blue Bottle Coffee kiosk at the south end of the Ferry Building) is worth singling out. This nonprofit helps launch local, lower-income food business, a great place to sample a kaleidoscopic range of tastes—all-natural jams, fresh spring rolls, plantain chips, or mystipies (South African meat and veggie pies). The market takes place on Saturdays from 8 to 2 and Tuesdays from 10 to 2.

Celebrate Pi Day with songs, marches, and Pi- related foods on this international “geek” holiday that celebrates Pi(p), 3.1415926535, the number you get when you divide the circumference of a circle by its diameter. The brass Pi Shrine will be ceremoniously removed in preparation for its reinstallation at the museum’s new location at Pier 15 along San Francisco's Embarcadero. Join us on this special occasion to celebrate some of the Exploratorium’s quirky scientific traditions. Events will be presented with Spanish, Chinese and English text as well as by multilingual Explainers.