Dress up in costume for one of San Francisco Zoo & Garden’s most popular family Halloween events, “Boo at the Zoo,” on Saturday and Sunday, October 26 & 27! Trick-or-treat at multiple stations throughout the Zoo and watch animals gobble up gourds and enjoy Halloween-themed enrichment treats during the Pumpkin Stomp & Chomp. Dress up in costume and participate and watch the Costume Parade and Contest with judges choosing winners in several different categories. Have a creepy, crawly critter adventure at the Insect Zoo, teaming with more than a thousand multi-legged bugs.