Conversation so far:
who defeated the new york jets in the first monday night football game in 1970
Joe Namath and the New York Jets lost in the first ever Monday Night Football game in 1970, falling to the Cleveland Browns 31-21.

Question: when was the game played
Self-contained rewrite: when was the game in which Joe Namath and the New York Jets lost in the first ever Monday Night Football game to the Cleveland Browns 31-21