The Smithsonian Museum Day ticket provides complimentary admission for two people to Audubon Butterfly Garden and Insectarium on Saturday, September 21, 2019 ! Museum Day is an annual celebration of boundless curiosity hosted by Smithsonian magazine. Participating museums and cultural institutions across the country provide free entry to anyone presenting a Museum Day ticket. Visit the Smithsonian magazine Museum Day website to download your complimentary tickets. Please print your Museum Day ticket and bring it with you. Smartphone tickets cannot be accepted. Smithsonian Museum Day View All Events By attending this event you consent to Audubon Nature Institute's Photography Policy .