With about 4,000 people expected to attend the University of Colorado at Boulder summer commencement exercises Aug. 11 at 8:30 a.m. in the historic Norlin Quadrangle, attendees should plan to arrive early. Free parking will be available in the Euclid Avenue Autopark, lot 204 off 18th Street and Broadway, lot 310 off 18th Street and Wardenburg Drive, and in lot 308 at Regent Drive and Kittredge Loop Road. Lots 359 and 378, near Folsom Stadium, and the Regent Drive Autopark also are open and free.