July 28, 1973 –
Bill Graham produced the Summer Jam at Watkins Glen Rock Festival at the Watkins Glen International Raceway, that featured the Allman Brothers, the Band, and the Grateful Dead. The concert was estimated to have drawn some 650,000 people.
Many rock critics claim the event was the largest gathering of people in the history of the United States. 150,000 tickets were sold for $10 each, but for all the other people it was a free concert. The crowd was so huge that a large part of the audience was not able to see the stage.
The Haus of Dcaligari 