I just shot a night time day of the dead parade. I hadn’t shot at night for awhile. No flash, just ambient light ( street and building lights) Was shooting at 1600 but quickly went to 6400+ ISO. Many shots were blurry but some real keepers though.

I would shoot with your fastest lenses to temper the ISO setting. And, as others stated walk the route around the planned time and shoot the traffic to work out your settings.