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All reserved-seat holders long before the gates were thrown open, the spokesman said, adding that if ticket holders lost their seats, "I think they must have been to their seats and gotten up."

Anyone holding full tickets, not stubs, for reserved seats at the performance may get a refund by mailing in the tickets, the spokesman said.

Young Group Praised

County police credited a group of young people who described themselves as the staffs of unidentified Baltimore underground newspapers with helping to control the demonstrative gathering and to prevent worse disorders.

The Merriweather Post Pavilion spokesman also praised the efforts of underground newspaper representatives to control the crowd.

"I give them a lot of credit," the spokesman said. "They were orderly."

The trouble, the spokesman said, "was certainly minor, in the face of all the people who were there."

A massive traffic jam ensued as the performance closed about 11 P.M., leaving hundreds of young people stranded. Parents who had driven them to the concert were unable to get back to pick them up, police said.

Police department telephones were flooded with calls from anxious parents seeking word of lost children.

Taken To Police Station

An uncounted number of the stranded youngsters were ferried to the county police station, to be reclaimed there by their parents.

The two major roads available for entrance and egress to the area around the pavilion were completely clogged with vehicles, although the county police force was supplemented by 19 state policemen sent in from the Waterloo, Greenbelt, Rockville and Westminster barracks to aid in traffic control.

The gate-crashing effort at Sunday night's concert by a group called the Procol Harem resulted in five arrests.

Trespassing Charge

Leroy B. Doster, 19, of the 3000 block Lavender avenue, Baltimore was charged with trespassing and Ronald A. Podboy, also 19, of the 200 block East Biddle street, was charged with disorderly conduct.

Three younger boys were held for Juvenile Court action as a result of the Sunday night disturbance, which caused damage estimated as in excess of $2,000 to the south box office.

The next two performances are unlikely to attract the same sort of crowds drawn to the Columbia pavilion the last two nights.

The National Symphony Orchestra will perform Thursday night. Saturday afternoon the United States Army Field Band and Soldiers Chorus will present a free Fourth of July concert.

The next rock booking is for The Association July 14.