The Canadian embassy hosted a dinner-reception for Prime Minister Pierre Trudeau and his wife, Margaret, last night.Vice President and Mrs. Mondale represented the Carter administration at the affair.

The Trudeaus arrived at the embassy 20 minutes before the guests arrived for dinner. Among the dinner guests were assistant to the President Hamilton Jordan and his wife, Nancy; Chief Justice of the U.S. Warren E. Burger and Mrs. Burger, Secretary of State Cyrus Vance and Mrs. Vance, Treasury Secretary W. Michael Blumenthal, Commerce Secretary Juanita Kreps, and Sen. Hubert H. Humphrey (D-Minn).

Press coverage of the event was restricted, although the impression had been left that there would be open coverage of the party since President and Mrs. Carter would not attend. However, only five minutes were alloted for pre-dinner photographs.

Canadian embassy spokesman Robert McGavin said the evening would be covered by a "writing pool" made up of a reporter from The Toronto Star and an unnamed French newspaper reporter.

One reporter who tried to enter the reception was ushered, out by Canadian Ambassador Jack Warren.

Asked why the affair was closed to the the press except for five minutes of photos, Warren said the procedure had been planned all along.

Warren wouldn't say whether recent press coverage of Mrs. Trudeau, who was critized by various fashion designers for wearing a short evening dress to the White House State dinner on Monday, had prompted the restricted coverage.

For the black-tie fete at the embassy, Mrs. Trudeau wore a white, sequinned dress that fell just below her knees. Prime Minister Trudeau sported a red rose in his lapel and looked relaxed as he talked to guests just inside the dining room.

Former Secretary of the Navy John Warner was there with his new wife, actress Elizabeth Taylor. Taylor wore a diaphanous black embroidered dress over a white outfit.

The guest list for a 10:30 p.m. reception after the dinner included State Department Director of Canadian Affairs John Rouse and his wife, Guggenheim Research Institute's Lionel Tiger and his wife, Canadian Ambassador to the OAS Arthur Blanchette and his wife, and Quebec Delegate General Guy Poliquin.