OK, I confirmed that there were 21 dressing rooms stage right backstage at the Fox. They were stacked up 8 floors via stairway.
The VIPs would likely get individual dressing rooms on the lower floor[[s), while the "chorus" would get dressing rooms for 3 [[or possibly more) on the higher floors. There was likely enough dressing room capacity to easily handle 100 performers.
So THE WALL had the star performers autographs on the lower wall, until that filled up and then the autographs started spiraling up the staircase. It appears that later on specific sections were allocated to different performance groups, which made for more orderly signing areas than the mayhem on the first floor.
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