Over 750,000 people descended on Seattle, a city of 630,000, in 20 degree weather for the Seahawks parade, and beside overflowing trash containers and some transit delays, about which we were warned extensively, every business jammed and busy, and the occasional bit of mild frostbite, the day was grand and joyous. Beautiful clear blue sky, quite unusual this time of year, with only a mild breeze. See more here:
Best of all, not a lick of trouble. No arrests, no uncontrolled crowds. I can think of a number of cities that would have experienced violence and some level of riot.
I attribute this, partly, to Seattle being a pretty laid back city. But also, this was not an alcohol-based event. Everyone was out and about, not sitting in bars, homes, or the stadium pounding back beer. The riots will just have to wait for another time.