February 7, 1981

IRANIAN RIGHTISTS BREAK UP RALLY BY DEFIANT LEFT TEHERAN, Iran, Feb. 6 (By Reuters) - Five thousand Iranian leftists, demonstrating in central Teheran in defiance of a Government ban, were attacked by right-wing Islamic extremists today with rifles, knives and rocks. Thirty-nine people were reportedly treated for bullet or stab wounds after the clashes, which were said to have been ended by security forces. The demonstrators, from a Marxist-Leninist faction of the Fedayeen movement and the Marxist-Leninist Peykar group, at first converged on Azadi Square in the western part of the capital to protest the steady deterioration of the economy in the two years since rule by the Shah was ended. But Islamic revolutionary guards had already taken up positions at the square. They fired their weapons into the air, and the demonstrators moved to Tohid Square near the center of the city.

Ronald Reagan made his debut in ''The President's Surprise Party'' tonight, and he played his leading man's role to perfection. ''What's on for today?'' Mr. Reagan asked his special assistant, Helene von Damm, when he walked into his White House office on the morning of his 70th birthday. Eleven hours later, the former movie actor took his place in a production that would have impressed Darryl Zanuck. The cast: such Hollywood celebrities as Frank Sinatra and James Stewart, and more than 100 other friends of the President. The props: 12 birthday cakes, each topped with a jumping white horse and the initials R.W.R.

A new glut in world oil supplies may be developing, officials of Western governments and international oil companies say, and by summer more oil may be available to consumers than they require. Moreover, the growing supplies are putting pressure on some OPEC producers to cut back the surcharges they have added to their official oil prices. ''The thing that happened last year was that demand for oil was dropping much faster than anybody anticipated,'' a senior official of a West European government said in an interview. ''It flabbergasted virtually every Western government and all the major oil companies.''

Because of the drought emergency, the city is looking into the possibility of digging a well under Shea Stadium to supply the New York Mets with water to keep their ball park green. Both the Mets and the Yankees have been told that, when their seasons begin, they may be prohibited from watering the grass. There is already a well under Yankee Stadium that was used in the big drought of the 1960's.

About 500 of President Reagan's political supporters met here today in private sessions to plan a grass-roots campaign to put public pressure on Congress to approve Mr. Reagan's economic program. The meeting was organized by the President's ''kitchen cabinet,'' an informal advisory group that includes wealthy Californians who are longtime friends of Mr. Reagan. The main goals of the new ''coalition conference'' will be to encourage passage of the President's entire economic program without its being dismantled or significantly changed by Congress, according to Administration and Congressional sources. Charles Wick, the main organizer of the coalition, denied that the coalition was a ''pressure group,'' but other sources described its purpose in terms of political leverage.