FREE. Write letters to Santa, cookie decorating, free refreshments, holiday games, photos with Santa, & more. 5-8 p.m. Rohnert Park Callinan Sports & Fitness Center. 5401 Snyder Ln., Rohnert Park. (Add’l parking at Rancho Cotate High School. 5450 Snyder Ln., Rohnert Park.) tinyurl.com/2k94s2sa.