While casual browsing for nice posters I found this oddity:
Altho I can't understand why someone would release a poster 15y after the Gig, wouldn't some Info in the "Notes"-Section about that odd fact be interesting/necessary?
This isn't a case of "someone" releasing a poster (as in a gig or the artist), but that the band was re-releasing a popular image coupled with a new "live concert album". This has become a regular thing for DMB, but not limited to them only. Phish has done it at least once (Halloween 1995 recording and poster) and I would swear there are others, but not coming to mind.
Agree though that notes always help to explain these things better, mostly for those not exposed or familiar with a specific band's practices.