June 20-22 for 2018
You can also check out passes from any Chicago Public Library for free admission to the museums.
They tend to post free days also on the website
Other than free days for Illinois residents, you can get free admission on 1st Saturday of every month if you have a Bank of America credit card
This month are the 20-22nd for all i know so far...
For residents of Illinois, the free admission days for June are the 20-22th.
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