September 17 – Constitution Day
Date(s) - Sep 17 - Sep 18
Constitution Day (or Citizenship Day) is an American federal observance that recognizes the adoption of the United States Constitution and those who have become U.S. citizens. It is normally observed on September 17, the day in 1787 that delegates to the Constitutional Convention signed the document in Philadelphia.
When Constitution Day falls on a weekend or on another holiday, schools and other institutions observe the holiday on an adjacent weekday.