Conversation so far:
What was the Mercury Theatre?
Breaking with the Federal Theatre Project in 1937, Orson Welles and John Houseman founded their own repertory company, which they called the Mercury Theatre
How did Orson Welles come up with the name Mercury Theatre?
The name Mercury Theatre was inspired by the title of the iconoclastic magazine, The American Mercury.
Who else worked with Orson Welles besides John Houseman?
Orson Welles was executive producer, and the original company included such actors as Joseph Cotten, George Coulouris, Geraldine Fitzgerald, Arlene Francis, Martin Gabel, John Hoyt, and Norman Lloyd.
Was anyone else part of Olson Welles crew besides John Houseman, Joseph Cotte, George Couloris, Geraldine Fitzgerald, Arlene Francis, Martin Gabel, John Hoyt, and Norman Lloyd?
Other actors of the Orson Welles' original Mercury Theatre company included Vincent Price, Stefan Schnabel and Hiram Sherman
When did the Orson Welles' Mercury Theatre first open?
The Mercury Theatre opened November 11, 1937
What play did the Orson Welles' Mercury Theatre company first perform?
The Orson Welles' Mercury Theatre company first performed Caesar, Welles's modern-dress adaptation of Shakespeare's tragedy Julius Caesar.
What was said of the Orson Welles' Mercury Theatre company's performance of Welles' adaptation of Caesar?
Joseph Cotten described the performance of Orson Welles' Caesar as so vigorous, so contemporary that it set Broadway on its ear.“
Did the Orson Welles' Mercury Theatre company perform other shows besides Caesar?
Beginning January 1, 1938, the Orson Welles' Mercury Theatre company persormed Caesar in repertory with The Shoemaker's Holiday
What did the Orson Welles' Mercury Theatre company perform after The Shoemaker's Holiday?
After the Shoemaker's Holiday, the Orson Welles' Mercury Theatre company performed Heartbreak House (April 29, 1938).

Question: Was that the last performance they had?
Self-contained rewrite: What was the last performance the Orson Welles' Mercury Theatre company had?