A flag day is a holiday which is related with flags, a day for celebration a historical event such as a nation’s adoption of its flag.
Flag days are usually in national statutes, but in some countries a decree by the head of state can also set a flag day. The statute or decree may specify locations where flags are flown and how are they flown.
The dates of the flag day:
The United States of America – June 14
The United Kingdom:
England – April 23
Scotland – November 30
Wales – March 1
Northern Ireland – March 17
Ireland – April 24 or Easter Monday