The fourth annual meeting of the Atlantic Treaty Assembly will be held in Boston and vicinity during the week beginning Sept. 21. The Boston Regional Conference on NATO Affairs will sponsor the meeting along with its New York counterpart.

Fifteen countries of the North Atlantic Treaty Organization will be represented by 60 to 80 delegates, among them Frank Pace, Lester B. Pearson, Paul-Henri Spaak, and John Fcster Dulles. Spaak and Dulles will be the featured speakers of the week, addressing a banquet at the Sheraton Hotel a week from Saturday.

Robert R. Bowie, Director of the Center for International Affairs, Henry A. Kissenger, Associate Director of the Center for International Affairs, Edward L. Katzenbach, Director of the Harvard Defense Studies Program, and Morton G. White, professor of Philosophy, will represent Harvard during the week-long activities.

Monday and Tuesday of next week, the delegates will hold closed meetings at Babson Institute, which are expected to be the real substance of the session. On Wednesday, they will come to Harvard, where they will be broken up into small groups, each of which will have lunch in one of the Houses. Later, they will be officially greeted by Edward Reynolds, Administrative Vice-President, and then go on a student-led tour of the University.

Thursday will be taken up by a trip to Newport, R.I., where the delegates will be taken out to sea on U.S. and Canadian destroyers to watch the America Cup Challenge. A news conference and panel-discussion open to the public are scheduled for Friday, and Saturday's banquet will close the meeting.