Amanda and Kelly go to the Rolling Stones concert
After Amanda loses the air hockey game, she tells Buttermaker that for losing, she has to go with Kelly to the Rolling Stones concert. If there was a Stones concert in Southern California, it had to be in July of 1975. In 1976 the Stones only performed in Europe.
The Rolling Stones Tour of the Americas took place from June to August of 1975. Their California dates were July 9, 10, 11, 12 and 13 at the LA Forum. Then two nights at the Cow Palace in San Fransisco (July 15 and 16).
Since Kelly told Amanda that they were to meet on a Friday, that means they probably attended the show on July 11th.
On this tour, guitarist Mick Taylor was officially replaced by Ronnie Wood. Ian Stewart (piano) and Billy Preston (keyboards) were the other support musicians. An album called LOVE YOU LIVE which contained some recordings from the LA Forum run, was released in 1977.