How does memory work? I really don't know. It seems logical that you remember the important events in your life: your child's first spoken word, scoring the winning goal, that time I left my car keys in a foreign country. You probably remember these events because you make an effort to do so. Memories will be reinforced by constant re-telling of the events by you or by friends & family. However, even for those important events it is possible for memories to be wrong. Two people can have a shared experience and yet their respective memories of the sequence of events can differ. That can be a heady mix at this time of year, just add the stress brought on by all the preparations and some Christmas spirits and voilà: a barney.
Usually (concert) gigs belong to that form of show business where the core part of the audience pleasure is provided by some musical diversions but the spectacle forms part of the overall package. An exemplar of this approach are Queen concerts which were (and probably still are) musical entertainments of the highest order but defintely set out to be great spectacles too, which they always achieved.
I decided recently to dig out some of my old cassette tape music albums. Most of them are pre-recorded tapes of albums purchased in the 1980s but there are also many home recordings of vinyl LPs . I wanted to make digital copies of the albums and include them on my collection which I carry with me on my mobile 'phone. I had a quaint notion that with a bit of work the music on the tapes could be of acceptable quality. Boy, was I wrong.