As I attended the event it was interesting to see this policed. OPP were in full effect, most corners had an OPP officer with prominently displayed Assault Rifle.
There was an OPP Heli circling the event non stop circling around 2 police drones in the air that were watching the crowd.
I thought it was cute the OPP drones used left/right Blue Red alternating lights A little drone cruiser if you will.
Must be somewhat boring for the pilot (unless they are using automated software) as one would run out of batter another took its place never flew around just sat and hovered for the 5 hours I was there.