The no. of events in sport was 18 . 386 from 138 nations,136 from 29 nations competed in Judoat the Games of the XXXI Olympiad . It was held in May 27 – June 13 . The sport has the official site chicagomarathon.com . The venue for Judoat the Games of the XXXI Olympiad was Pauley Pavilion,Carioca Arena 2 . 24 (from 5 confederations) teams competed in Judoat the Games of the XXXI Olympiad . 5 September 1971 is when Judoat the Games of the XXXI Olympiad was founded 
All the events of the sports Judoat the Games of the XXXI Olympiad are conducted in National Equestrian Center,North Greenwich Arena (trampoline, artistic)