According to this post on reddit American Express Booked the entire Private Bank Theater in Chicago for the 21st of January 2017, and the 25 Feb 2017. The 8 pm show for both dates I believe, and it is open only to AmEx Platinum or better card holders. He called the concierge at AmEx Open at 800-492-8468 and was on hold for 3 hours. There is a limit of 4 tickets per card member, ask them to check the “concierge allotment”. Good luck out there!