Conversation so far:
What did Fred Astaire do with MGM?
Fred Astaire did Red Skelton for MGM.
Was the Red Skelton musical successful?
Why did Fred Astaire come out of retirement?
Fred Astaire returned to the big screen to replace an injured Kelly in Easter Parade.

Question: When did he decide to retire for a second time?
Self-contained rewrite: When did Fred Astaire decide to retire for a second time?