Need Advice!

Options
Next week my work is having a lunch potluck to celebrate Christmas. They are shutting down the office for the lunch hour, locking the doors, forwarding the phones, etc... I really do not want to be involved in this because of the temptation. I am trying to eat as "healthy" as possible until the true "holiday", then I will enjoy myself on Christmas Eve and Christmas Day with my family. I am so weary about this because I have been snacking on little things here and there already this month and have gained 2 pounds so I am discouraged and trying to get back on track for the few days I have left until the holidays truly come. Anyways! My question is... Would it be rude for me to dodge out during the lunch hour and then return to work that afternoon when I know the party is over and the mess is cleaned up?? Any advice would be wonderful! Thank You! Happy Holidays!