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A pristine poster from the Grateful Dead’s first concert is up for auction, but hardcore Deadheads will have to splurge to get their hands on the historic item. The colorful hand-drawn crayon sign ...

bears a message scribbled in crayon by one of the Merry Pranksters asking, “Can you pass the Acid Test?”, along with an address and no other details about the event. It was preserved by two sisters ...