Prototyping Festival

The Central Market Showcase displays prototypes that serve the community in some way. Imagine a Bench-Go-Round, interactive public seating that encourages pedestrians to connect to each other. Presented by the YBCA, the San Francisco Planning Department, and the Mayor’s Office of Civic Innovation. On display 24 hours a day. Through Oct. 25. Market Street between Sixth and Seventh streets, San Francisco. Free. www.marketstreetprototyping.org.