Most Holy Trinity Catholic Church, East Hampton, L.I., was the setting Sunday at 4:30 p.m. when Darcy K. Rawlings and Jonathan M. Buscaglia were married by the Rev. James F. Keenan, president of St. Peter's Preparatory School, Jersey City, N.J., formerly of Canisius High School. Gayle Rawlings of Center Moriches, L.I., and David Rawlings of Bayville, L.I., are parents of the bride. Nancy Craig of Snyder and Dr. Anthony Buscaglia of Williamsville are the bridegroom's parents. A reception was given in East Hampton Point. The couple will live in Buffalo after a trip to Hawaii. A graduate of Union College, the bride is a pharmaceutical representative of Pfizer. The bridegroom is a graduate of Canisius High and Union, magna cum laude. He is a fourth year student in University at Buffalo School of Medicine.