I'm going to try to say what I want to say here as sensitively as possible:
It's very VERY
VERY difficult for parks to keep up with all the dietary restrictions and choices that people make these days. I'm glad you are doing your Research for your friend
@belsaas , but I would make the same recommendation as I did for my cousin who has to eat gluten free when we went as a family reunion: pack some things in case they don't have anything prepared. Yes, Vegan/Veggie/GF is becoming more popular but some of the options are so limited with those items and BGW has so many options overall that it's hard for them to track exactly.
So as much as your friend really wants to just be able to enjoy the day I would be advising them to just be prepared un case BGW doesn't have anything fitting those dietary restrictions available at the time.