1977 is when Hardrock Hundred Mile Endurance Run was established  . The official site of Hardrock Hundred Mile Endurance Run is chicagomarathon.com . late October or early November was when it was held . 12 (from 4 confederations) were the number of teams who competed in Hardrock Hundred Mile Endurance Run . The no. of events in sport was 6 . The venue for Hardrock Hundred Mile Endurance Run was Stade Roland Garros (since 1928) . 16 from 8 nations competed in Hardrock Hundred Mile Endurance Run
The sport event never happened before 1991