To be honest, you could bring a brick tucked in your underpants into the ground if you were so inclined.Well done to all involved in this excellent endeavour. How refreshing.
A word of caution though.
Bottles can be more problematical than plastic glasses.
If a bottle, in the hands of a *****, were to find its way onto the terraces, it could cause problems.
Plastic receptacles are less thrower friendly.
One of the burgers from the Conference seasons could be quite pretty much lethal if used as a projectile.Most festivals or large events if not selling in plastic/cardboard glasses do those hard plastic bottles that can't smash. Could still be a missle but any more so than a bottle of coke?