1. Always the first Monday in September. First celebrated on September 5, 1882
  2. Thought to be the brainchild of Matthew Maguire...a machinist in NJ
  3. Became an official U.S. Holiday in 1894
  4. Don't wear white after Labor Day? Seems to have originated with rich folks wearing white on their summer vacations and then putting on dark colors once they returned to the dirty city after Labor Day