Workshop. “Darkness and Invisibility.” 12:30- 2 p.m., Smart Museum of Art, 5550 S. Greenwood Ave., 773-702-0200, free. U. of. C. faculty present “on darkness as a value in etching, terror and the sublime and Antarctic darkness.” Space is limited. R.S.V.P. by sending an e-mail to email@example.com.