I have attended trade shows, etc, at this venue. What is the total capacity allowed by the Fire Department?
Tht could be another good clue about their anticipated ‘celebration’.
According to freeper markomalley in this thread:
http://www.freerepublic.com/focus/f-news/2946406/posts
“The absolute largest facility in McCormick Place has a capacity of 11,500 people...”