Photo Editors: Walkers will enter Norlin Quadrangle at 5:30 p.m. to begin the closing ceremony with breast cancer survivors leading the way. The University of Colorado at Boulder Office of Community Affairs will host the closing ceremony for the Colorado leg of the "Avon Breast Cancer 3-Day," a national event to raise money for breast cancer research taking place in nine cities during summer 2001. An estimated 8,000 people, including 3,000 walkers, will be on campus Sunday, Aug. 5, at 5:30 p.m. for the closing ceremony in Norlin Quadrangle.