Ah... the old problem raises its head. I was 3 weeks in to sole source last year when ny Birthday came and double whammy it landed on easter day too , I had lost 16 lbs and like you didnt want to spoil it, to be honest I was so motivated and had found it so hard the first 2 weeks that there was no way I was going to jeapodize my diet by eating so I persuaded my foodie friends , who always like to celebrate all our birthdays by eating to do somethiing different this year , so off we went to see a show, and you know what they loved it and its started us doing much more interesting activitys on our birthdays now. There really are other ways to mark the day and feel special, besides eating and drinking (Ok I didnt mange to stop them quaffing the old wine , but I enjoyed sparkling water in a champagne glass, knowing that on my next birthday I would be slim. Well my bithday is just over a week away and I have given myself the best birthday present this year ever a slimmer healthier body , with a wardrobe of size 14 clothes that this time last year I could only have dreamed of fitting in. So my advice , find another way to celebrate, there really is more to life than stuffing your face, you just have to find something else to do that makes you happy, knowing you will have lots of slim birthdays to come when you can eat and drink , isnt missing the feed for just one year worth it?
Happy Birthday in advance , have a brill time whatever you decide.