Share Add to favourite. Read on Mobile Enter Reading Mode FREE Museum Tickets (September 21st Only) – Reserve Yours Now! Posted on August 16, 2019 by Shanmu Priya Freebies On September 21st, score a FREE Museum Ticket for two from Smithsonian Magazine! Museum Day is an annual celebration in which participating museums and cultural institutions across the country provide free entry to anyone presenting a Museum Day ticket. Check participating museums in your area here, and complete the registration form to get your FREE Museum Tickets