My ds has pretty strong food allergies, but luckily not anaphylactic as I know many moms here who's children are. We don't do Sunday School, but in general, whenever we are going somewhere - playdate, preschool, party, etc. - I pack a special snack for him. I try to make it his favorite, most special foods, so that he is glad to have them & does not feel left out. If he is going to be without me, I make sure the adults know about his allergies and that he is only to eat the food & drink I have provided. If I do not feel this will be enforced, either I do not leave or he does not go. I have learned to chose my battles and sometimes, when there is going to be a lot of party food circulating, we may not attend. It's easier than having to say no. My ds is 5. So he understands his allergies and is really good about asking if he can eat something before he does. It has been tough, and heartbreaking at times as we have sorted through this all, but we are starting to find a system that works for us. HTH.