Pelons are extremely rare "practice pieces" for the early t-shirt designs. Before production was initiated, the image or design was tested on cotton cloth or burlap to determine the color and line accuracy of the piece. Only a few of the "tests" were preserved once the design was deemed acceptable and the t-shirt went into production.
Bill Graham's Day on the Green concerts were the first prototypes of "festival" shows - multi performer sets in stadium settings. Staged on the lawn of the Oakland Coliseum, the Day on the Green concerts were a summer series started in 1973 that continued until shortly after Graham's death in 1991.
This item was part of Bill Graham's personal collection and shows some damage from the May 7, 1985 firebombing of his San Francisco office. The attack stemmed from Graham's open and honest criticism of President Reagan's visit to Bitburg Cemetery published in the San Francisco Chronicle.