Carioca Arena 2 were the venues of  Detroit Grand Prix . 28 from 28 nations were the competitors in  Detroit Grand Prix . The official site of  Detroit Grand Prix is www.hardrock100.com . 24 (from 5 confederations) were the number of teams who competed in  Detroit Grand Prix . The no. of events in sport was 18 . It was held in 28 July – 3 August 2012 . 1963 is when  Detroit Grand Prix was founded 
31 people competed in the  Detroit Grand Prix