Children in costumes trick-or-treat throughout the park. Must register for 1 of 5 slots: 11:30 a.m.–noon., noon–12:30 p.m., 12:30–1 p.m., 1–1:30 p.m. & 1:30–2 p.m. $5–$10. Additional fee for carousel & train rides. Howarth Park. 630 Summerfield Rd., Santa Rosa. Sign up: srcity.org/2164/Halloween-at-Howarth.