The Society: Holidays: (Constitution Day Holidays )

Constitution Day is a U.S. holiday observed September 17. It commemorates the Sept. 17, 1787, signing of the U.S. Constitution. Constitution Day was designated as a national holiday in 1994. The law that created the holiday also dicates that all U.S. schools receiving any federal funding must provide instruction directly related to the history of the U.S. Constitution on this day. When the holiday falls on a weekend, schools are encouraged to observe it on the adjoining school day. Constitution Day Holidays Society.

Constitution Day is a holiday to honor the constitution of a country. Constitution Day is often celebrated on the anniversary of the signing, promulgation or adoption of the constitution, or in some cases, to commemorate the change to constitutional monarchy : (wikipedia)