Conversation so far:
When did Stirling leave racing?
Moss announced on Radio Le Mans that he had finally retired from racing, saying that he had scared himself that afternoon.
He was 81.
When did he return to racing?
Although ostensibly retired from racing since 1962, Moss did make a number of one-off appearances in professional motorsport events.

Question: What is one of the motorsport events that he participated in?
Self-contained rewrite: What is one of the motorsport events that Stirling Moss participated in?