The sport has the official site chicagomarathon.com . Melbourne (since 1972) were the venues of  Caesars Palace Grand Prix . 18 events were there in  Caesars Palace Grand Prix . 18 from 18 nations were the competitors in  Caesars Palace Grand Prix . It was held in late October or early November . 5 September 1971 is when  Caesars Palace Grand Prix was established 
The sport  Caesars Palace Grand Prix had 18 contestants 