BLUE MOUNTAIN LAKE On Saturday, Sept. 27 the Adirondack Museum at Blue Mountain Lake, will participate in the fourth annual Museum Day, presented by Smithsonian magazine. Museum Day is an opportunity for museums and cultural institutions nationwide to open their doors free of charge to Smithsonian readers and Smithsonian.com visitors. A celebration of culture, learning and the dissemination of knowledge, Smithsonian's Museum Day reflects the spirit of the magazine, and emulates the free-admission policy of the Smithsonian Institution's Washington, D.C.-based museums. Last year, nearly 100,000 people attended Museum Day. All fifty states plus Puerto Rico were represented by 651 participating museums. This is the second year that the Adirondack Museum has taken part. Attendees must present Smithsonian magazine's Museum Day Admission Card to gain free entry to participating institutions. The Museum Day Admission Card is available in the September 2008 issue of Smithsonian magazine. The general public is welcome to participate by going to the Smithsonian.com web site and downloading the Museum Day Admission Card. Listings and links to all participating museums and sponsors can also be found on the site.