Bring your family to celebrate the Harvest Moon in Hanley Park. Carve your own pumpkin, and enjoy a tree-climbing experience. There will also be live music performed on the front porch of the Hanley House.
Free. 4 to 7 p.m. at Hanley Park in Clayton.
More information: claytonmo.gov
Explore the St. Louis Zoo after dark at Boo at the Zoo. Bring your little ghouls and goblins to this non-scary celebration designed just for kids. Though this is not a trick-or-treating experience, costumes are encouraged, and each child 12 and under will receive a treat bag when they leave.
Engage your young scientist in science-related learning at the Saint Louis Science Center's Preschool Science Series. Through interactive stories and hands-on exploration, children learn about science, as well as language, problem-solving and social skills.