16 (from 6 confederations) teams participated in Chicago Marathon . The official site of Chicago Marathon is www.hardrock100.com . April 23–29 was when it was held . Chicago Marathon was established on 2005 . The no. of events in sport was 18 . The venue for Chicago Marathon was Paris, XVIe,France . 28 from 28 nations competed in Chicago Marathon
The sport event never happened before 2005