28 July – 9 August 2012,12 August was when it was held . The sport has the official site chicagomarathon.com . The no. of events in sport was 14 . Pontal, Rio de Janeiro,54.5 km (33.9 mi),ExCeL Exhibition Centre were the venues of Men's middleweight boxingat the Games of the XXX Olympiad . 12 (from 4 confederations) were the number of teams who competed in Men's middleweight boxingat the Games of the XXX Olympiad . 37 from 31 nations were the competitors in Men's middleweight boxingat the Games of the XXX Olympiad
The sport Men's middleweight boxingat the Games of the XXX Olympiad has 37 contenders  from more than 8 nations