In celebration of its 10th Anniversary, GenerationTheatre offers its audience a free run of Knock or the Triumph of Medicine, Jules Romains’s celebrated comedy about the relationship between medicine and money. Translated and directed by David Valayre, the production runs September 8 through 18 with curtain times on Thursday, Friday, and Saturday at 8:00 p.m. and Sunday at 3:00 p.m., at the Southside Theatre, Fort Mason Center, San Francisco.