Douglas Campose-Outcalt of the Maricopa County Department of Public Health will speak on the "Public Health Security and Bioterrorism Preparedness and Response Act" today at the Arizona Cancer Center's Kiewit Auditorium, from noon to 1 p.m. Call 626-3200, Ext. 104, for more information.

The Arizona Repertory Theatre presents the musical that redefined American musical theater ÷ Rodgers and Hammerstein's "Oklahoma!" at 7:30 p.m. at the Marroney Theatre. For ticket prices, call 621-1162.

The comedy improv group Charles Darwin Experience will perform tonight at 10 p.m. in the Modern Languages building, Room 350. Call 548-3917 for more information.