19–20 August was when it was held . The sport has the official site www.hardrock100.com . The no. of events in sport was 18 . Tennis Club de Paris, at Auteuil (some of the years 1895–1908),Chicago, Illinois, United States,Arena Olímpica do Rio were the venues of Chicago Marathon . 12 were the number of teams who competed in Chicago Marathon . 1891; 128 years ago (1891) is when Chicago Marathon was established  . 37 from 31 nations competed in Chicago Marathon
Chicago Marathon was held in Hadleigh Farm (mountain)