The Museums on Us® program through Bank of America allows cardholders to gain free admission to over 70 museums on the first weekend of every month. Participants simply show their Bank of America ATM, credit or debit card or check to participating museums to gain free general admittance. 
Visitors who present a valid Bank of America/Merrill Lynch ATM, credit or debit card, along with photo identification, can receive one free all-access admission ticket on the first full weekend of each month in 2010. Free admission benefits are not transferable and are valid for the cardholder only so bring all your ATM/credit cards.
Chicago Museums participating in this promotion and who will allow BofA customers in free the weekend of the month include:
The Museum of Contemporary Art (not on Sunday though)
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2010 Free Weekends – The free weekends for this program are:
* January 2-3, 2010
* February 6-7, 2010
* March 6-7, 2010
* April 3-4, 2010
* May 1-2, 2010
* June 5-6, 2010
* July 3-4, 2010
* August 7-8, 2010
* September 4-5, 2010
We are going this weekend. This will help out with costs.
This will totally help me out! I’m disabled, on a fixed income which doesn’t allow much money to do things, so now i have something free to look forward to do every month. Still fairly new to chicago, so will check out the history and maybe shedd aquarium saturday. I love bank of america and chicago. I also love art and will be an art major in school so this totally helps.
Does this promotion work with a BA Mastercard as well?
[ed. -- yes, per the post, any ATM, credit or debit card issued by B of A counts --have fun]