Here are a selection of photographs from the event.
1. The Canadian National Auto Circus, Boston, 1973
A crowd of 2,000 turned out to watch the event, held at The Boston Speedway stadium, in New Hammond Beck Road. Photo: Boston Standard
2. The Canadian National Auto Circus, Boston, 1973
The Boston spectators were lucky - the circus cancelled its previous seven performances due to bad weather. Photo: Boston Standard
3. The Canadian National Auto Circus, Boston, 1973
That said, this umbrella would suggest the weather was less than ideal. Photo: Boston Standard
4. The Canadian National Auto Circus, Boston, 1973
Another one of the milder stunts from the event. Photo: Boston Standard