They can be in small groups to follow different patrols, as few as 3 or 4. Larger groups as they gain momentum. (This is all in my imagination of course.) I was picturing a little portable sound system with circus music, but silly instruments would do.

I recommend blasting (or playing) these classic protest songs also. youtu.be/l1PrUU2S_iw?...

And this one, whichever version. Easy to sing along. youtu.be/atTA58_uz7E?...