Conversation so far:
what did James Dean do in cinema?
American teenagers of the mid-1950s, when Dean's major films were made, identified with Dean and the roles he played.
what were some films he was in?
Rebel Without a Cause.
did he star in any others?
September 30, 1955 .

Question: what happened on that date?
Self-contained rewrite: What happened on September 30, 1955?