The parade was a good 75% just people walking, hardly any vehicles or floats, so I'm given to understand that they just moved out of the way. It was still interesting that it happened at all, organizationally; while it's possible that the destination was only accessible via the parade route, the road the parade was on has a lot of connecting streets, and I'd like to think that enough people were informed ahead of time for it not to be an issue. Apparently not so!