It was held in late October or early November . The no. of events in sport was 18 . 5 September 1971 is when  Caesars Palace Grand Prix was established  . 18 from 18 nations competed in  Caesars Palace Grand Prix . Melbourne (since 1972) were the venues of  Caesars Palace Grand Prix . The official site of  Caesars Palace Grand Prix is chicagomarathon.com
The sport  Caesars Palace Grand Prix has more than11 contestants  from 18 nations