AMHERST, Mass. - Rudolph Crew, chancellor of the Board of Education of the City of New York and a UMass alumnus, will deliver the main address at the 129th Commencement of the University of Massachusetts, to be held at 10:30 a.m. on Sun. May 23, in Warren P. McGuirk Alumni Stadium. Massachusetts Lt. Gov. Jane Swift will attend the ceremonies to deliver the greetings of the commonwealth. Approximately 4,000 undergraduates are candidates for bachelor’s degrees.