You mention urban events. Something I am increasingly aware of is the danger of crowds. The History and Discovery channels have had some excellent past programs on crowd dynamics in an emergency. Be it fire, criminal act or earthquake as many, if not more people become statistics from being trampled. Recent battlefield research shows how the French at Agincourt charged into a muddy funnel and Queen Boudica's huge force was trapped between a tiny, but well positioned Roman Legion and their own wagons. If your wedged in a crowd of punk rockers slam dancing or a bunch of Celts on Saint Patrick's day in a pub it's hard to access either Photon 2 or great grandad's Webley <img src="/images/graemlins/grin.gif" alt="" /> I pay as much attention to exit access at public events now as I do seating. Fortunately the Hollywood Bowl is wide open and the crowd pretty gentile, excepting the Mozart groupies <img src="/images/graemlins/blush.gif" alt="" />