It isn't unprecedented. 1964 Sugar Bowl
yeah, but I wouldn’t cite that. In 1957, Louisiana passed the law forbidding mixed race sports, and we can argue over how exactly that was applied, but at the same time northern teams largely boycotted that game. That is why from 1957 until the end of 1964, those games are a bunch of southern teams playing each other, including a rematch of the famous LSU versus Ole Miss Billy Cannon game from 1959. It is no accident that the federal civil rights act was passed in June 1964 and Syracuse played in the game on New Year’s Day of 1965 against LSU.
But there’s another one that affects our history, the 1966 Rose Bowl between Michigan State and UCLA. That year, UCLA opened their season on the road in Lansing against the Spartans and lost. But because of the uproar over 1964‘s national champion, they decided to include the bowl games and just by chance, Michigan State wound up in a Rose Bowl rematch of the season opener against UCLA in Pasadena and lost. Because of the rematch, Alabama won the associated pressure share of the national championship when we beat Nebraska that evening, and it allowed us to go back to back.