AMHERST, Mass. - Former U.S. Senator from Maine George J. Mitchell, who negotiated the latest agreement during the recent peace talks in Northern Ireland, will deliver an address at the University of Massachusetts undergraduate Commencement ceremony, to be held at 10:30 a.m. Sun. May 24 in Warren P. McGuirk Alumni Stadium. Mitchell will receive an honorary degree, along with broadcast journalist Charlayne Hunter-Gault, who will also address students at the ceremony.