Ok, so maybe this is a stretch for a post. But I feel like I owe it to Flag Day to at least acknowledge its historical claims, since I've always poked fun at it as a sort of pseudo-holiday. In the United States, National Flag Day is celebrated on June 14, the day on which the flag of the United States was adopted by the Second Continental Congress in 1777. It wasn't until almost a century and a half later, in 1916, that June 14 was officially proclaimed Flag Day by Woodrow Wilson. An Act of Congress established National Flag Day in August of 1949. You can look up Title 36 Sec. 110 of the US Code to read the official statute on Flag Day.
If you are so moved by this holiday, you could visit Troy, New York, for the largest Flag Day parade in the country. Or, if you prefer to just read more about the history of the day, click here.