Constitution Day & Citizenship Day is 9/17

 Constitution Day & Citizenship Day is on 9/17 so many schools will celebrate it on 9/16.

Technically, "Each educational institution that receives Federal funds for a fiscal year is required to hold an educational program about the U.S. Constitution for its students." - Commemorating Constitution Day and Citizenship Day - US Dept. of Education

The Smithsonian has some good (and free) resources to recommend if you are interested.

You may also want to check the National Constitution Center https://constitutioncenter.org/

and the National Archives Constitution Day

https://www.archives.gov/news/topics/constitution-day