I'm also wondering the same thing I have GA for Philly on 7/15. I've called new era(ticket agency that sold the tickets for the show) and the last time I called the woman said that they didn't have an exact number as to how many people are in the pit, it will be full but not to the point that we can't see anything or be able to move(if that makes any sense at all) I'm gonna keep calling them periodically to see if they have anything numbers for the pit

the seating chart for philly the GA pit looks smaller than what it would be at giants.......I know for the baseball games at citizens bank park it holds 43,500 people not sure the capacity for concerts since Buffet has been the only other person to play a show there and I haven't found any numbers on that