You might want to spend some time browsing the exhibits at Tsiolkovsky Memorial House Museum, A.L. Chizhevsky House Museum, or Museum of Workmanship Architecture and Daily Life. You can watch performances at Kaluga State Drama Theatre, Demi Obninsk Experimental Theater, and Kaluga Regional Theater for Young Spectators if you're interested in local theater. If you want to see more of the surrounding area, you might plan a visit to Tsiolkovsky State Museum of Cosmonautics History and Kaluga XXI Century.