FREE. Food, games, sneak peek at summer classes, in conjunction with Rohnert Park Chamber of Commerce Annual Business Showcase. 11 a.m.– 2 p.m. Benica Pool open for free swim: 2–4 p.m. (located behind Tech High School). Technology High School. 550 Bonnie Ave., Rohnert Park. tinyurl.com/2dbxf7bm.