We all have our favorite holiday, whether it’s Christmas or Halloween or Thanksgiving or July 4. But are you aware that there are over 1,500 officially declared holidays, which adds up to more than four holidays every day of the year? Starting chronologically and extending all the way to December 30, here are 50 holidays that sound like so much fun, they really need to be widely celebrated. 1. National Hangover Day (January 1) If you drank too much on…