September 20th is Ashura:

“In Sunni Islam, Ashura also marks the day that Moses and the Israelites were saved from Pharaoh by God creating a path in the Sea, and is the Islamic equivalent to Yom Kippur. Other commemorations include Noah leaving the Ark and Muhammad's arrival in Medina.”

https://en.m.wikipedia.org/wiki/Ashura

It is also called Hussein Day…

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September 17 is also Citizenship Day or “ I Am an American Day”

“In 2004 under Senator Byrd's urging, Congress changed the designation of this day to "Constitution Day and Citizenship Day" and added two new requirements in the commemoration of this Day. The first is that the head of every federal agency provide each employee with educational and training materials concerning the Constitution on September 17th. The second is that each educational institution which receives Federal funds should hold a program for students every September 17th.”

https://www.loc.gov/law/help/commemorative-observations/constitution-day.php