Anti-freeze is both attractive and deadly to cats. Anti-freeze and caustic chemicals stored in the garage spell certain disaster if a cat comes in contact with them. Although it may seem like an attractive idea to keep a normally indoor-outdoor cat in the garage over the winter, please keep them in the house. If you need to keep your indoor-only cats away from the festivities, consider a "Safe Room," as discussed below.
Let's face it: some foods are just too rich for cats and will cause tummy upsets; sometimes even diarrhea. Cats with specific medical problems should eat the special foods prescribed for those problems. Giving them table scraps will only ruin their appetites for the foods they really need.
On the more serious end of the scale, certain foods are downright toxic to cats, and should be avoided at all times. That gravy-slathered turkey likely contains onions, which are highly toxic to cats. The bottom line is that it may be okay to give kitty a tiny scrap of roasted turkey (in the kitchen, not at the table), but avoid encouraging "cats as dinner guests," if you get my gist.
Traditional Thanksgiving dinners are often loaded with ingredients that can make cats very ill, such as onion-laced stuffing and gravy, vegetables with rich sauces, and that butter-basted turkey itself. Allow kitty to join in the celebration with a thin sliver or two of turkey breast or giblet. Better yet, prepare his own Turkey Delight meal ahead of time, along with a teaspoon or two of plain canned pumpkin (not pumpkin pie mix) for "dessert."
Cats may feel neglected when a crowd of visitors consume your time. Try to set aside 15 minutes to spend some quiet time with your cat an hour or so before guests are due to arrive. Ask Aunt Mabel to stir the gravy while you give kitty more lovies just before dinner. You'll both be more relaxed, and you can enjoy your friends and family without guilt.
My family has had a tradition for several years of giving thanks for the cats who have given us so much in terms of companionship, endless entertainment, and unconditional love. I wouldn't have traded a single one of them for all the riches in the world.