May 18–23 was when it was held . 2005 is when  Detroit Grand Prix was established  . Open ground were the venues of  Detroit Grand Prix . 16 (from 6 confederations) teams competed in  Detroit Grand Prix . The sport has the official site city2surf.com.au . 28 from 21 nations competed in  Detroit Grand Prix . 18 events were there in  Detroit Grand Prix
There were 18 events in  Detroit Grand Prix