Last year I had Christmas diner on two days consecutively - we have two offspring - I made Yorkshire puddings using bread flour, cream diluted with water instead of milk, lots of eggs, beef dripping in the pans - ate roast carrot and parsnip plus assorted steamed low carb veges, Yorkshire pudding, lots of turkey with ordinary gravy, and then more Yorkshire pudding, and both days my BG was 5.6mm/l two hours later.
When I weighed myself a week later I was slightly heavier, but another week and that had gone.
Normal days are under 40 gm of carbs - but just once in a while seems absolutely fine.