U.S. flag displayed in the National Center for the Constitution, Philadelphia. Photo by Jeffrey M. Vinocur, via Wikimedia. Constitution Day is September 17.
Flag flying dates in September? Three more (you flew your flag for Labor Day, right?):
- September 9, for California statehood
- September 11, for Patriot Day (not listed in the U.S. Flag Code, but encouraged in other law. Public Law No. 107-89)
- September 17,for Constitution Day
Ready?
More:
- California Admission Day
- California Admission Day, September 9, 1850 – California Parks and Recreation
- Patriot Day
- Patriot Day – 9/11 Commemorations and Memorials
- Constitution Day
- Teaching With Documents/Constitution Day, U.S. National Archives
- Constitution Day page from the National Constitution Center (Who is behind ConstitutionDay.com?)
- Dates to fly the flag, and links to the U.S. Flag Code in U.S. law
Trivia note: The U.S. flag is not mentioned in the U.S. Constitution.
Millard Fillmore's Bathtub 
It’s probably a designated flag-fly date in Maryland (wracking memory; did I ever fly my flag in Maryland on that date?).
But not on the national radar. Thanks for the reminder.
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How about Defenders Day (September 12)–it used to be a State holiday in Maryland. Battle of Baltimore when the rocket’s red glare helped Francis Key see to pour his beer and write new lyrics to an old drinking song.
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