We're lucky for Thanksgiving that it will be just our immediate family, so I can make sure that we have food here that I can gorge myself on. Turkey, non-starchy vegetables, salad. Yes, we'll also have plenty of carbs, too, but I know that I can make a majority of my meal low-carb. We do have growing children, so we have to have some carbs available for them. I won't promise to stay away from the carbs, though.
It's not as easy to be "picky" when you're having a holiday meal at the home of someone else. I've heard some suggest eating something beforehand, so then you only need to take a small plate. Others have suggested bringing a dish (or two) that you know you'll be able to eat. I would love to hear from other diabetics about how you handle holiday dinners.