Conversation so far:
what did James Dean do in cinema?
American teenagers of the mid-1950s, when James Dean's major films were made, identified with Dean and the roles he played.
what were some films James Dean was in?
Rebel Without a Cause
did James Dean star in any other films besides Rebel Without a Cause?
East of Eden is a 1955 drama film. The film stars James Dean in his first major screen role.

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