The Gilbert & Sullivan Opera Company, in collaboration with the University of Chicago’s Special Collections Research Center, has mounted an exhibit of past production costumes, props, programs, photos, set models, and other material to celebrate the Company’s 50th Anniversary. Since 1960, the Company has performed every work in the Gilbert and Sullivan canon, some as many as 6 or 7 times, under its policy of alternating the signature operas (such as The Mikado, being performed this month on March 12-14) with the obscure.

Joseph Regenstein Library reading room, 1100 E. 57th St., Chicago. The exhibit is open to the public and will be on display through March 21, 2010.