Had a super tasty company BBQ here, clear signs for diets (vegetarian, lactose-free, gluten-free). Now a BBQ/buffet is always difficult with cross-contamination but that everything is labeled was super nice. Even options at the dessert buffet (sorbet ice cream, fruit and brownie).
Service was a bit stiff here and there, certainly friendly but empty glasses were not removed when new drinks were brought and if your neighbor ordered you had to be quick otherwise they were gone before you had ordered. But that's a minor thing.