Having holiday dinner with family, also having birthday dinner in a wee. can i eat what i want both times if i eat required calories rest of the week?

If normally healthy: A normal healthy person can count the total calories, the types of calories (sugar, simple carbs, complex carbs, unhealthy fat, better fat, protein, etc...), and the variety of foods in her diet over a period of several days or a week. Life is not exact. Thus, what she eats in one day is not as important as what she eats over the course of each week, or on an ongoing basis.