Dr. and Mrs. William H. Crocker of Washington, D.C. announce the marriage of her daughter, Grania Nano Michelle Beauregard to George Nichols Allport of New York City. The ceremony took place last Saturday at Holy Trinity Church in Georgetown and was performed by the Rev. James M. English and Dr. Charles Copenhaver of Bronxville, N.Y.

The oldest of six children, the former Miss Beauregard is daughter also of Henry G. Beauregard, a partner in the Washington law firm of Sullivan, Beauregard, Clarkson, Moss and Brown. She is the maternal granddaughter of Mrs. P.J. Smyth of Dublin, Ireland. Her stepfather, Dr. Crocker, is associate curator of South American Ethnology for the Smithsonian Institution.

A recent graduate in nursing from Columbia University, the bride is an alumna of Georgetown Visitation Preparatory School and graduated with a BS from Boston College in 1975. She spent a summer in Brazil on a filming expedition for the Smithsonian and the following year took courses at the American College in Paris.

Mr, Allport is the only son of Mr. and Mrs. Peter W. Allport and the only grandson of Mr. and Mrs. George Nichols, all of Bronxville. His paternal grandmother is Mrs. Mildred Allport of McLean, Va. After graduation from the Brooks School, North Andover, Mass., Mr. Allport went to get a BA in history at George Washington University in 1976 and since then has been working for Chubb and Son, Inc. as an underwriter in the Commercial Casualty Department in New York City. His father is president of the Association of National Advertisers.

The couple will live in New York City after a trip to Europe.