What is Constitution Day?
Constitution Day and Citizenship Day is observed each year on September 17 to commemorate the signing of the Constitution on September 17, 1787, and “recognize all who, by coming of age or by naturalization, have become citizens.”

See a virtual tour of “Amending America” exhibit about how the United States Constitution has been amended in order to mirror our changing nation.
https://youtu.be/MLeatO9-giY

You can learn more about Constitution Day by visiting the following websites:
https://www.uscourts.gov/about-federal-courts/educational-resources/annual-observances/constitution-day-and-citizenship-day
https://education.blogs.archives.gov/2020/09/04/constitution-day/