For Thanksgiving (or Christmas), the main thing is that you don’t use it as an excuse to binge eat.
I imagine you’ll eat a very good-sized meal and probably have a dessert too. At the high end, that’ll be something like 1500 kcal over your usual consumption for the day. Please don’t feel guilty about this — we are the product of our daily habits, not the occasions.
A 1500 kcal surplus will reduce the fat loss that week by 3/7th of a pound (or ~1/5th of a kilo). So, in the grand scheme of things, it’s not a big deal.
You could try to make up for this by reducing the calorie intake on the other days of the week before and after if you wish. But that’s not a requirement as long as you’re ok with having half the results in one single week.
Importantly, know that the scale weight and measurements will likely bump upwards by a few pounds due to the increase in food, water, and gut content. This won’t be fat gain.