Have a friend who was a scheduled C-section on Jan 11. I razzed her all last week about having a Christmas baby. Well, she missed and the baby was born at lunch time (12:32) today, 12/26. The mother is still worried that the baby's birthday will still get lost in the holiday. The mother's birthday is 12/28.
You get used to getting lost in the shuffle. My mom tried the 1/2 birthday trick in June, it didn't work out.
On the other hand you can spend the month between Thanksgiving and Christmas telling everyone all of the parties, good eats and decorations are in honor of your birthday-------and, everyone gets your birthday off from work!