The University Center Info/TicketMaster window is selling the last few Green Day tickets to UM students, staff and faculty. The April 15 performance at the Convocation Center has been sold out but there are a small number of tickets remaining for UM buyers only. Students can stop by on weekdays from 8:30 a.m. to 3:00 p.m. to buy up to four tickets at $39.25 each.