Not sure but we've had some "interesting" shows. One involved everyone attending covered in ash and sparks, we had fun anyway.
Hahahaha! I have people that intentionally go to the seating area closest to the fallout zone just to exerience that; safety glasses, hardhats for the whole group. Kind of overkill but pretty funny. Ashes and sprks are parr for the course if the crowd is downwind for up to a 1/4 mile sometimes.