Pontiac Stadium has sold out all 70,000 tickets for the Saturday performance of the English group the Who, the stadium's first rock concert.

Stadium officials said Wednesday that the gates will open at 6 p.m. for the 8 p.m. concert and that shuttle bus service from downtown Pontiac to the stadium will begin at 5 p.m.

Seating at the concert, which is expected to last about three hours, is on a first-come basis. There will be seating without chairs on the stadium playing field. Chairs could damage the field, officials said.

Officials said concert-goers should also know that:

• Cans and bottles are banned by stadium policy, but thermos bottles are allowed. Cameras and tape recorders will be banned at the request of the concert promoters.

• No beer will be sold at the concert because a large part of the crowd is expected to be under the legal drinking age. Hot dogs, hamburgers, soft drinks and other sandwiches will be sold at concession stands.

• If all goes well with the building's heating system, the temperature inside will be about 62 degrees.

• Plainclothes police and stadium security people will patrol inside the stadium, watching for drug use violations.

• Canadians who have not received their tickets because of the mail strike can pick up the tickets at a "will-call" window at the stadium's north gate.

• Parking in the stadium lots' 15,000 spaces will be $1 per car. Parking in nearby private parking lots may range from $1 to $5. The stadium's 3,000-car auxiliary parking lot on Opdyke Road just south of M-59, will be open all day for early arrivals. The main stadium lots will open at 5 p.m.

• Concert-goers who are being driven to the stadium are advised to have their drivers drop them off at the shuttle bus lots, avoiding traffic closer to the stadium.

The shuttle bus service, 50 cents one way or $1 round trip, has pick-up points at Saginaw Street and Oakland Avenue; Saginaw and Water Streets; Water and Mill Streets, and E. Wide Track Drive and Pike Street, all in downtown Pontiac.

There is free parking for 4,000 cars at those sites.