January 8–11, 15–18, 22–25, 29–31 February 1, 5–8, 12–15, 20–22, 26–27 March 14 June 4–7, 11–12 September 4–6, 10–13, 17–20, 24–27 November 12
They have free days but it doesn't say which days they are,just say have proof of Illinois residents
The next free days are until June
I am not sure! You have to check the museum! You can get free passes from the library!
From the past.. its usually Tuesday.. But they may change due to an event they may have...
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