Get a jump start on Halloween at the Brookfield Zoo.Boo! at the Zoo is this weekend at Brookfield Zoo for those little ghosts and goblins who want a jump start on Halloween.Boo! at the Zoo is open Saturday and Sunday from 10 a.m. to 4 p.m. National Pumpkin DayNational Pumpkin DayThursday is National Pumpkin Day, and Brookfield Zoo has a giant one on display! Report a correction or typo