9500 Liberty reveals the startling vulnerability of a local government targeted by national anti-immigration networks using the Internet to frighten and intimidate lawmakers and citizens. Prince William County, Virginia, becomes ground zero in America’s explosive battle over immigration policy as elected officials adopt a law requiring police officers to question anyone they have “probable cause” to suspect is an undocumented immigrant. The documentary film screens on Friday, July 2 at 7 p.m.; Saturday, July 3 at 4 p.m. and 8 p.m.; and Sunday, July 4 at 4 p.m. and 8 p.m. Admission is $6 for UM faculty, staff, non UM-students, seniors, and alumni; free for UM students. General admission is $8. For more information, visit www.cosfordcinema.com.

Joan Rivers: A Piece of Work takes the audience on a yearlong ride with legendary comedian Joan Rivers in her 76th year of life. Peeling away the mask of an iconic comedian and exposing the struggles, sacrifices, and joy of living life as a groundbreaking female performer, the film is an emotionally surprising and revealing portrait of one the most hilarious and durable women in the history of comedy. The film screens on Friday, July 2 at 9 p.m.; Saturday, July 3 at 2 p.m., 6 p.m., and 10 p.m.; Sunday, July 4 at 2 p.m. and 6 p.m.; and Monday, July 5 through Thursday, July 8 at 8 p.m. Admission is $6 for UM faculty, staff, non-UM students, seniors, and alumni; free for UM students. General admission is $8. For more information, visit www.cosfordcinema.com.

Steven Rosenfeld, John and Elizabeth Harris Professor of Neurology and director of the Division of Neuro-Oncology in the Department of Neurology at Columbia University’s College of Physicians and Surgeons, will present “Motors, Movement, and Malignancy” on Friday, July 2 from 10 to 11 a.m. in the Lois Pope LIFE Center, seventh-floor auditorium.

Nicolas Sluis-Cremer, director of the Basic Research Division of Infectious Diseases in the Department of Medicine and associate professor of medicine at the University of Pittsburgh School of Medicine, will present “Rational Design of Nucleoside Reverse Transcriptase Inhibitors for Drug Resistant HIV-1” on Friday, July 2 at 12 p.m. in the Gautier Building, Room 118.