The Arizona Historical Society, 949 E. Second St., puts on its 27th Annual Bookfair from 10 a.m. to 1 p.m.

John McGrath speaks on "Bio-Thermal Science and Engineering" at 1:30 p.m. in the Arizona Health Sciences Center, Room 5403.

Barry Osmond presents "Imaging and imagining leaf photosynthesis under stress" at 4 p.m. in the Haury Anthropology building, Room 129.

Lakota author Delphine Red Shirt will speak as part of the series "The Poetics and Politics II" series at 7:30 p.m in the Modern Languages auditorium.