A little off topic, but related. My cousin and I rode our bikes downtown to Niagara Falls to the Rainbow Mall in 1983. the Grateful Dead was playing a show in the old Convention center, now casino. It was so easy to walk on that roof from the base. Just walk up the from the sides and you could go all the way to the top.
Anyway... we get downtown and there must have been literally a 1000+ Dead Heads camped all over that roof, top to bottom with sleeping bags, blankets. coolers, smoking doobies, screaming etc... This was like at 1 or 2 pm, crazy!
No police, probably didn't even make the news, just the way it was back in the day.
Good times!