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When did The Tonight Show Starring Johnny Carson move to Burbank?
On May 1, 1972, the show moved from 30 Rockefeller Plaza to Burbank, California.
Why did The Tonight Show Starring Johnny Carson move to Burbank?
The show moved from 30 Rockefeller Plaza to Burbank, California, because of the studio's proximity to celebrities.
What happened after The Tonight Show Starring Johnny Carson's move to Burbank?
From July 1971, Carson stopped hosting five shows per week. Instead, Mondays featured a guest host, leaving Carson to host the other four weeknights.

Question: What did he do?
Self-contained rewrite: What did Johnny Carson do after having a guest host on Mondays for The Tonight Show?