— Boo at the Zoo: Visitors can pop by more than 25 treat stations for candy and non-food treats. Costumes welcome, 4-8:30 p.m. Friday and Saturday, Cheyenne Mountain Zoo , 4250 Cheyenne Mountain Zoo Road, $22-$24, tickets online only; cmzoo.org .

Boo at the Zoo at the Cheyenne Mountain Zoo is Friday and Saturday. Tickets must be bought online. (Jerilee Bennett, The Gazette)

— Hillside’s Halloween House Party: The Hillside Community Center will offer a family-friendly event with trick-or-treating, dancing, music and games. Bring a bag for candy and prizes, 6-8 p.m. Friday, 925 S. Institute St., free; coloradosprings.gov/hillside .

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