The last Chicago card didn't draw very well.
In fact, Chicago keeps drawing less and less each year.
Since August they've had record low attendances in Japan, Pittsburgh, Mexico, the Netherlands, as well as the record low attendance for PPV in the T-Mobile Arena. I stopped looking after that.
I also put together the attendance history of two of the most recent events below. Continual drops.
SAITAMA SUPER ARENA JAPAN
02/26/2012 - 21,000 (Edgar vs. Henderson)
03/03/2013 - 14,682 (Silva vs. Stann)
09/20/2014 - 12,395 (Hunt vs. Nelson)
09/27/2015 - 10,137 (Barnett vs. Nelson)
09/23/2017 - 8,571 (Saint Preux vs. Okami)
PITTSBURGH
06/26/2011 - 7,792 (Kongo vs. Barry)
02/21/2016 - 7,330 (Cowboy vs. Cowboy)
09/16/2017 - 7,005 (Rockhold vs. Branch)