Yes while I cited Live Aid I too fail to remember games though I know I attended most of our big games since 1976. I remember being outside the Baseball Ground prior to our cup Replay, our 1-0 victory in the league away at Liverpool a year prior to the cup victory, yet only remember standing by...
It is indeed something that has been discussed in regard to the use of lie detectors. Many experts believe reaffirming of a distance memory (of a non fact) the person does truly believe the event happened.
The big events that people say they attended but in fact they MAY have watched on TV...