Depends on what you mean by “adjust”. If it means that I don’t have a right to ask his school to ask other parents to bring only nut free snacks for the class Christmas party, I disagree. Those types of requests are perfectly reasonable. I agree, however, that I don’t have a right to require other parents to send peanut-free lunches with their kids every day. My son can simply be careful around his friends at lunch.
You can certainly ask, but they’re under no obligation to do so. I personally would respect your request as I think it’s quite reasonable. I think most parents would since they understand the worries of a parent.