Oh what a shame CLKD. Theatres & concert venues can be very claustrophobic, with the feeling that it's difficult to get out in a hurry if panic sets in. I remember at the height of peri with flushing & the associated panic at their worst, feeling I needed to get out of an old theatre during a Christmas production of Nutcracker or Swan Lake but we were mid-row, squashed in, right up in the Gods & it was very dark - no chance of getting out without everyone having to stand up. Nightmare!