In response to public interest, Roger Williams Park Zoo will keep its doors open late every Saturday in August. Guests will have a chance to enjoy animal exhibits and the new Hasbro’s Our Big Backyard exhibit during the magical (and cooler) twilight hours. Zoo Admissions will be open from 9 a.m. to 8 p.m., with the Zoo closing at 9 p.m., Aug. 4, 11, 18 and 25. Regular Zoo admission applies.