Boo at the Zoo is the WILDEST trick-or-treat with an expected attendance of more than 16,000 visitors over the two-day weekend, now with extended hours! The event offers a fun-filled day with trick-or-treat stations, animal encounters, children’s activities, games, frightfully-delightful decorations and much more! Boo at the Zoo provides families a FUN and SAFE environment to celebrate Halloween along with the Zoo’s exotic and wild residents, the animals.