Buttonwood Park Zoo is participating in the 5th annual Free Fun Fridays program sponsored by the Highland Street Foundation. On Friday, July 19, 2013, Buttonwood Park Zoo will open its doors at no cost to visitors all day long. Free Fun Fridays is a program that includes 60 museums and cultural venues across Massachusetts. Each Friday this summer, there will be six venues open for free. The program begins Friday, June 28th and runs through Friday, August 30th. For the full program schedule and to learn more about Free Fun Fridays, please visit: www.highlandstreet.org.