The no. of events in sport was 18 . 386 from 138 nations were the competitors in Men's handballat the XXXI Olympiad . The sport has the official site chicagomarathon.com . Olympic BMX Center (BMX) were the venues of Men's handballat the XXXI Olympiad . It was held in 1–12 August . 1977 is when Men's handballat the XXXI Olympiad was founded 
386 contenders from 138 nations