Even the combined opposition of the five other entries will have a tough one blemishing Harvard's perfect track record as the Crimson hosts the Greater Boston Invitational track meet in Briggs Cage. Field events and running trials start at 6 p.m. tonight, and running finals start at 2 p.m. tomorrow.

Only Northeastern has a prayer of Challenging Harvard. Both Boston College and Boston University were lopsided losers to the Crimson earlier this year and M.I.T. and Tufts just are not back powers.

The cage record in the shotput should be broken tonight. Northeastern's Carl Vallin will probably put his name into the Harvard record books unless Art Croasdale comes up with the best put of his career. Minutes afterwards, Croasdale squares off with Northeastern's Bill Corsetti, the only other collegian in the Boston area who can break the 60-foot mark in the 35-pound weight throw.

Chris Pardee can ignore his competition and concentrate on the yardstick again tonight in the high jump, and he may well rewrite his own Harvard record of 6 ft., 9 in. Ken Winters will again need to improve on his best vault to place high in a large field of pole vaulters.

Aggrey Awori is expected to be a triple winner. He is favored to take the broad jump, dash, and hurdles. Tonight he has only the broad jump to worry about, since even a mediocre performance should qualify him for the finals in the dash and the hurdles.