As you know by now, the CU-Boulder campus will be closed to non-affiliates from 12 to 6 p.m. on Sunday, April 20. This closure, now in its third year, is necessary to avoid serious disruptions to the university’s academic mission of research, teaching and learning. The campus remains open to all students, faculty and staff. Visitors who have official business, meetings or other officially sanctioned activities on the CU-Boulder campus had an opportunity to obtain a visitors’ credential. The credential request deadline -- Sunday, April 13 -- has since passed.