Conversation so far:
What was the Mercury Theatre on the Air?
Welles and Houseman founded their own repertory company, which they called the Mercury Theatre.
What did this company do?
The Mercury Theatre opened November 11, 1937, with Caesar, Welles's modern-dress adaptation of Shakespeare's tragedy Julius Caesar -.

Question: How did the play do?
Self-contained rewrite: How did the play Caesar do?