Heaps of trash, and overflowing dumpsters. Those can be cleaned away in time for the parade, but what's to stop others from throwing more trash once the street is clear?

[nothing, really. but as he speaks, some people wander out of the buildings-- dressed flashily, and nehan immediately knows they're from organized crime as well. or hired thugs with a boss with a lot of cash to throw around.

and then they start yelling at each other.]

And now there's an altercation. [he sounds bored, really.]