For the first time, Brookfield Zoo is adding a third weekend to its annual Boo! at the Zoo Halloween celebration, presented by Ferrara Candy Company. From 10a.m., to 4p.m., on Saturdays and Sundays, October 13-14, 20-21, and 27-28, guests of all ages can show off their Halloween costumes plus enjoy family-friendly and spooky-fun activities. Guests of all ages are welcome to join in the Costume Parade, which kicks off at 1:00 p.m. in front of the Discovery Center and ends on the West Mall. Following the parade at 1:30 p.m., zoogoers can show off their Halloween attire and enter the Costume Contest. General zoo admission is $21.95 for adults and $15.95 for children 3-11 and seniors 65 and over. Children 2 and under are free. Parking is $14. (Additional fees apply to some Boo! at the Zoo activities.) For further information, visit CZS.org/Boo or call (708) 688-8000.