Question: what days are chicago museums free?
Answer: Adler Planetarium: January 7-9, 20-22. February 4-6, 11-13, 17-20. ...  Field Museum: January 8, 15, 20, 22, 29. February 1-29. ...  Museum of Science and Industry: January 6-9, 13-16, 20-23, 27-30. ...  Shedd Aquarium: January 16-20.