Rolling Stones Concert Site

This is where the stage was set up, 80 feet wide, 30 feet deep, three feet high, and facing south by southeast toward a low natural amphitheater. A day after the event, a sensationalist London tabloid ran a banner headline that the Stones had played to a crowd of 500,000. That number immediately passed into urban legend, but the actual attendance was more like 25 or 30 thousand. OK, maybe 40,000, tops.
However many were there, there was no shade, no water, and for the public convenience there were 17 porta-potties: six to the right of the stage and eleven to the left. (And you thought the lines at Burning Man were long.)
Photo shows a few of the three or four dozen Hell's Angels present, about an hour into the Stones' two hour show, as they move to stage front and dispense their own rough-and-ready version of "crowd control." Mellowzulu is in this picture, with light reflecting off his glasses. Can you guess?