If you have friends or family with allergies coming to Thanksgiving, make a little placecard that lets people know if something contains nuts or seafood or anything that might make them ill. You could even be kind to vegetarians. There are templates for palcecards available free many places on line. And it might save you the trouble of having to jab someone with an epi pen or call an ambulance. I have a friend who is quite allergic to nuts and I give all the guests a quiz about ingredients in dishes they’ve brought. If there are nuts, they get to sit in the nut area of the buffet with a decorative little warning.