Children in costumes trick-or-treat throughout the park. Must register for 1 of 5 1/2-hr. slots: 11:30 a.m., noon, 12:30, 1, 1:30, & 2 p.m. Passes $7–$20. Carousel, train, & pony rides: add’l fee. 11:30 a.m.–3 p.m. Howarth Park. 630 Summerfield Rd., Santa Rosa. tinyurl.com/yf2ab23u.