Those of you sweating out Washington's heat can take comfort in the fact that a taxpayer-financed get-together of the American Establishment will be taking place today and tomorrow, at one of the nation's great summer watering spots, according to the Aug. 11 Federal Register (page 53291).

The executive committee of the President's Commission for a National Agenda for the Eighties is meeting this afternoon at the Aspen Institute, high in the Rockies at Aspen, Colo.

The Institute, which draws an Establishment clique to the mountains each summer for thoughtful seminaring, tennis, swimming and cocktail parties, invited the commission this year to be part of the show. The commission, in case you've forgotten, is a $2.8 million government exercise in uplift that emerged from President Carter's depression last summer over the country's "crisis of confidence."

Today's session, which is open to anyone who can get into the institute's Boettcher West Seminar Room, will deal with "The United States and International Competitiveness: The Japanese Model."

The subject, a commission official said last week, was "something that Aspen had going" that "fits into two of our panels."

Tomorrow, the commission's panel on "Policies for Metropolitan and Nonmetropolitan Areas" will meet from 9 a.m. to 5 p.m. The two-day session will wind up tomorrow night when the commission's executive committee will be the feature at the institute's weekly evening presentation in Paepke Auditorium.

The purpose of the evening session, according to the Federal Register, "will be to present a town meeting in order to discuss commission activities."

When a question on the Aspen trip came up at a commission session last month, Keith Melville, a staff member, said, "Aspen's gotten reconceptualized three or four times. . . . It's now officially labeled an outreach event."