I go to my share of conferences, and I notice that often on the registration form it asks about food restrictions, and/or lists a contact. I always put my food allergy on the registration form and also always contact the conference organizers to let them know, and (more recently) also always identify myself to hotel staff.
Over the past year or two, hotels have gotten a LOT more accommodating for people with food allergies. It's still not the greatest, but I've been to two conferences in the past year where they took my allergy very seriously, going as far as to prepare a separate meal in each case. This was done for everyone who identified a serious food allergy or celiac, not just me. Compared to a few years ago, where I got served food despite writing on the conference form that I was severely allergic to it AND identified myself to the hotel, this is a complete 180.
Yet, every time I mention to hotels that I would really, really appreciate nutritional information for foods, they act like they don't know what I am talking about. Aside from the fact that 90% of the food at conferences tends to be high-carb, not having nutritional information makes bolusing very challenging.
Restaurants, in my experience, have also gotten a lot better in accommodating people with food allergies. When I was a kid my request was often completely forgotten by the server. These days, servers will often come back checking if such-and-such is safe with my allergy, or letting me know that such-and-such is not safe. Restaurants, unlike hotesl, have also gotten a lot better about making nutritional information available, either on their website or by request.
I'm curious, is nutritional information something that people tend to request at conferences? The only conference I have ever seen provide it is Children with Diabetes. I think that people in the food allergy community had to ask long and loud before hotels finally, very recently, started paying attention and doing something about it. I wonder if all of us with diabetes made this request every time we went to a conference, even if it was ignored at first, if hotels would start providing nutritional information on request as an accommodation.