One idea I have for dietary-sensitive potlucks is to put an ingredient card on every dish. That way, everyone knows what they can and can't take.
There is a meat substitute called seitan, it's pretty much what the vegans love and the celiacs can't tolerate. (Seitan is boiled or fried gluten.) If you could find some volunteer ovens that would limit cross-contamination with the turkey, it would be ideal.
Anti-shellfish is pretty much a given for a midwest thanksgiving. The only thing I can imagine happening is shrimp cocktail for appetizer.
Roasting carrots, onions, apples, squash, potatoes, cauliflower, and sweet potatoes in separate dishes according to vegan sensibilities should please most people. Just label the real butter and sour cream to be identifiable from the vegan substitues. There is always gravy for the omnivores.
Have a bowl of brown rice or quinoa for the vegans and celiacs. Make the vegans aware of the roll recipe and try to keep bread away from the celiac-friendly food.
Is stuffing the turkey with onions and apples instead of bread going to offend anyone's diet?
Sorry, I don't know what PKU is.
Edit: from what little I gleaned from the internet... the PKU can lump in with the vegans as long as the food is "clean"
I also forgot pure boiled beans with acid added in the cooling process. They're more of a salad garnish without spices and meat added and a bit of stewing after the acid, but there are probably few diets that would turn away properly-stewed beans.
For dessert, I'm not sure. Just label the jello molds on whether they were made with knox, agar, sugar, or sucralose.
Edited by: KELEKONA at: 11/10/2011 (17:52)