I think it's Thursdays for Illinois residents. Opened late evening on Thursdays.
Hi, Illinois and Chicago residents enjoy free museum admission every Thursday evening, 5:00–8:00. The museum is always free for children under 14, Chicago teens under 18, LINK and WIC cardholders, and Illinois educators. There is additional discounted admission for seniors (65 and up). You can learn more on our website under Admission Information. Thanks!
Give them a call.
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