Happening this weekend from 9 a.m. to 4 p.m.at CALM is the annual Boo at the Zoo event. Guests of all ages are encouraged to wear costumes. Children 12 and under plus CALM members are free.

Trick-or-treaters will make their way around the zoo while they visit with all the different animals at CALM like Pebbles the porcupine, bears and Pat the bat, and experience the natural gardens. There will be games, treats and festive decorations.

They will also be presenting wildlife presentations, animal encounters and several of the animals will receive their own jack-o-lanterns filled with their favorite treats. CALM is also offering rids on the Central California Children's Railroad for only one dollar. Plus, the Condor Challenge Climbing Tower is free.

This event is safe, kid-friendly and enjoyable for the whole family.