Every once in a while, a holiday can't hurt!
Easter, Christmas, Birthdays to name a few. Don't be the sourpuss "I'm on a diet - I can't eat that."
Eat healthy, enjoy the company, watch the portions, and don't stress over it. It is a holiday, not everyday.
Give yourself room to enjoy a special day with your family and friends. Enjoy the food, the occasion, the company, just do it in moderation. Give yourself room to break the streak if that happens, and don't beat yourself up.