[coolhandluke]

It seems that all of the "major" marches, gatherings, etc. in history have all been events that took place in one location.

One that comes to mind is the Million Man March[0] on the National Mall in 1995. I'm not sure it would have had the same effects it did if it were 2,000 men here, 4,000 men here, and so on.

[0]: https://en.wikipedia.org/wiki/Million_Man_March