Country?

This is America.

Liquor licenses are handled by the state or municipality.

At this particular venue (Xfinity Center)...no, I don't think so. Most of the vendors that are around are in carts with just beer, water, hard seltzer...maybe a canned cocktail or wine cooler.

Maybe at the counter-service vendors, where you could get mixed drinks. Possibly.

They do have water bottle stations though. And you can bring in one empty reusable bottle or one factory-sealed water bottle upto 1 gallon.

Who tf thinks to bring water to a concert tho. You pregame in the parking lot and after your second or third $30 beer...then you realize you really need a water.