Free concert. Enjoy Groovin’ on the Grass while you eat your lunch. Sponsored by the Universities Activities Board. Noon. UA Mall Stage
Film. “”X-Men III: The Last Stand”” is now playing on campus. 7 p.m. and 10 p.m. $3. Student Union Memorial Center, Gallagher Theater
Poker. Come out for No Limit Texas Hold ’em every Thursday and compete to play in the end-of-semester tournaments. 6 p.m. $5. Park Student Union, Games Room
UAB recruitment. The University Activities Board is a student-run, nonprofit organization providing UA students and the Tucson community with campuswide, affordable and diverse activities. Come meet with UAB chairs speed-dating style to find out how you can get involved. 3 p.m. SUMC, Ventana Room
Colloquium. The College of Optical Sciences colloquium presents “”Photonic Materials and Devices.”” 3:30 p.m. Meinel Optical Sciences building, Room 307
Farewell to Peter and Pat Likins. The university campus and community is invited to bid farewell to former President Peter Likins and his wife, Pat. Visit http://uanews.org/likinsfarewell to post a goodbye message that will appear in a slideshow during the event. 4 p.m. SUMC, North Ballroom
