6–20 August 2016 was when it was held . The official site of  Detroit Grand Prix is chicagomarathon.com . 40 from 30 nations were the competitors in  Detroit Grand Prix .  Société Athlétique de la Villa Primrose in Bordeaux (1909) were the venues of  Detroit Grand Prix . 17 were the number of teams who competed in  Detroit Grand Prix . 12 events were there in  Detroit Grand Prix
The sport  Detroit Grand Prix had more than 32 contenders 