Smithsonian Magazine is offering free general admission to a list of Chicago museums on its fourth annual Museum Day, this Saturday, September 27. Museum Day passes, which are good for two people (one card per household), can be printed from the magazine’s Web site here. The pass is good for entry to the Balzekas Museum of Lithuanian Culture, the DuSable Museum of African Art, the Hinsdale Historical Society, the Mitchell Museum of the American Indian, the Peggy Notebaert Nature Museum, the Swedish American Museum, and the Children’s Museum in Oak Lawn. Also participating in Museum Day (though always free, regardless of promotions) are the Freedom Museum, Intuit: The Center for Intuitive and Outsider Art, and the Smart Museum of Art.