Faculty Handbook: Academic Responsibilities of Faculty
2.26  Attendance at Commencement

At least one-third of the faculty members from each college should attend May and one-third should attend the December Commencement, as determined by the dean. Faculty are expected to be present and to take part in the academic procession, unless excused by the Provost and Vice Chancellor for Academic Affairs. The wearing of appropriate academic regalia is required at such functions. Faculty members who do not own academic regalia may rent them through the University Bookstore.