Why must lids be taken off on drinks bought at festivals?!
However you are allowed to bring in water only if it has a sealed cap..
So why do they serve drinks only without lids? And not let you keep the lids?
Because they are being sold to be consumed on the premises. If they were selling beverages to take home - it would require a different license, possible retail sales tax and inspection. Taking the lid of ensures it is for immediate consumption and not a retail sale.
because if it is a fizzy drink people shake them open the lid slightly and chuck it.
been told at a festival before
Because if the lid is on, they think you got it from an outside source