I've been to a few Sizzla shows. They are by and large my favorite shows to go to in terms of crowds. They get pretty rowdy, but in a good way.
However I think the citizens of Gambia put to shame any crowd in the U.S. The first clip is of people driving and walking to the show and the second is the opening part of the show.
If you have a second watch these to get a scope of how big dancehall is in the far corners of the world.