Calling all little ghouls, witches, princesses and super heroes to downtown Pleasanton. The annual Halloween Scavenger Hunt will take place on Saturday, October 21 from 10 a.m. to 12 p.m. while supplies last. *Please note treats will be limited to the first 600 children. Children 10 years old and younger are invited to come in costume and pick up a Halloween bag and parents will receive a clue sheet at the starting location outside of the Museum on Main at 603 Main Street. Children have to solve the clue in order to find the next downtown location, where they will be given a small goodie or treat and their next clue. Parents will be given the answers to all of the clues to help children find the treat locations.