Boo at the Zoo returns to the Philadelphia Zoo for three weekends of family-friendly activities. Guests can visit on Saturdays, Oct. 11, 18 and 25; Sundays, Oct. 12, 19 and 26; and an added date on Monday, Oct. 13. Hours are 9:30 a.m. to 5 p.m. each day, with a sensory-friendly morning on Saturday, Oct. 11, from 8:30 to 10 a.m. Admission to Boo at the Zoo is included with regular zoo entry and membership. Saturdays: Oct. 11, 18 and 25Sundays: Oct. 12, 19 and 26Monday: Oct. 13Philadelphia Zoo3400 W. Girard Ave.Philadelphia, PA 19104Included with general admission or membership.