the NHL is responsible for the operation. Not the teams and not the hosting venue. They might utilize the usual services but they control it. A few years ago the WC at Gillette had some concession issues. I know of some people who complained to the Patriots and to the Bruins, and they were advised to contact Bettman, et al.
"Food and booze definitely helps when it comes to battling the temperatures at these types of outdoor events". Having been to a number of these, including some where the air temp was in the mid-20's and even lower, you have to be suffering from a problem to think that "booze", at least in the form of beer, "definitely helps". "Food", yeah. Of course, I'm a season-ticket holder who doesn't understand why somebody comes to TD Garden and pays for parking, seats, and over-priced beer to get shit-faced midway in the 2d period when they could do the same thing at a bar with a big-screen. And no, I'm not excusing the apparent lack of planning.