19 Fall Crafts for Children; noon-2 p.m.; Café, Penn Bookstore (Penn Bookstore).

18 Hypothesis of the Stolen Painting; works of Jasper Johns, Sol Le Witt, Gerhard Richter, Alexander Calder, Oskar Kokoschka, and Josef Albers. Edward Fry on Barnett Newman and Documenta 8; papers from Edward Fry, curator and art historian. Through December 18. Hours: Wed-Sat. 11 a.m.-6 p.m. Slought Networks Gallery, 4017 Walnut St. United Bank; an in-windows series at 3945 Chestnut St. (GSFA; Facilities and Real Estate Services). Through December 2. Opening reception 6 p.m.; Slought Networks Gallery.

21 Six Degrees of Separation; 8 p.m.; Auditorium, Houston Hall (Student Performing Arts). Also October 22 and 23.

17 First Free Exchange; improv jazz musicians Ellery Eskelin with Andrea Parkins and Jim Black; 8 p.m.; Slought Networks; tickets: $8 (Slought Networks).

Penn Musicians Against Homelessness; 8 p.m.; Auditorium, Houston Hall (Student Performing Arts). Also October 18 and 19.

16 CD8 T Cell Responses to Bacterial Infections; Eric Pamer, Memorial Sloan-Kettering Cancer Center; noon; Austrian Auditorium, CRB (Microbiology).

18 Strategic Thinking: How Climate, Disease and Sociopolitical Structures Become Strategic Threats; Gary Smith, veterinary medicine; Robert Giegengack, geology; Arthur Waldron, history, and Harvy Rubin, medicine; 2-4:30 p.m., Zellerbach Theatre, Annenberg Center (ISTAR).

Between Abstraction and Simulation: Giacomo Balla's Iridescent Interpenetrations; Christine Poggi, history of art; 3:30 p.m.; Rich Seminar Room, Jaffe Bldg. (History of Art).

21 Art and the Gundaker Foundation; Zhe-zhou Jiang, artist; noon; rm. 225, Houston Hall (Rotary Club).

Mechanisms Controlling Expression of Utrophin at the Mammalian Neuromuscular Synapse: Insights into a Therapeutic Strategy for Duchenne Muscular Dystrophy; Bernard Jasmin; University of Ottawa; 2 p.m.; Class of '62 Lecture Hall, John Morgan Bldg. (PA Muscle Institute).