I once traveled with a college who was socially a bit hard to handle. So we go out to the valley from the Midwest and he keeps suggesting we go to burger joints with the local team that is about %70 Indian.
Everyone kept looking at me like "What the hell?".
One of the places I mentioned in another post did pizza on fridays as a teambuilding lunch thing. It would have been nice except it took us about two months to convince them to order a vegetarian pizza for our Indian coworkers. Didn't feel like teambuilding.
But as I meet more and more people with food sensitivities I think that providing food for an event is just fraught anyway, and maybe you should try something else.
That's really weird, when done right, it isn't that hard to find a vegetarian or similar alternative. Most places that cater or just about any place have good options these days.
At one place I worked we just used the same folks to bring in food. Rather than debate what they just had packages and we would check boxes (vegetarian, etc) and numbers and blamo reasonable food showed up.
I think the real issue is when you have folks who don't know what they're doing trying to manage it.
Everyone kept looking at me like "What the hell?".