Was there for the 10 year anniversary, 10years ago. The most strange and eerie public event I've ever been to. Really crowded for blocks around, but no noise. Nobody speaking. You could speak if you wanted to, and a few were, I got talking to the police chief, who had a full police livery corvette, but nobody felt like it. The strangest thing was a different groups there, in matching costumes or grouped together with banners. Conspiracy theorists, amish peace choir, British Jewish anti-muslim nazis (I kid you not, I have photos), crazy bearded religeous freak on roller blades with stars and stripes, normal people mourning loved ones, and many more. No fighting or animosity between any of the groups, I asked the chief about it, why not? 'Its the constitution pal". Never forget it.