Here are a selection of photographs from the event.
5. The Canadian National Auto Circus, Boston, 1973
Today, New Hammond Beck Road is home to B&Q, Lidl and Tesco. Photo: Boston Standard
6. The Canadian National Auto Circus, Boston, 1973
Lidl is home to a plaque that commemorates this part of Boston's past. It is built on what was the fourth turn of the stadium. Photo: Boston Standard
7. The Canadian National Auto Circus, Boston 1973
Some more of those that attended the event. Photo: Boston Standard
8. The Canadian National Auto Circus, Boston, 1973
A close-up of one of the stunts. Photo: Boston Standard