( in the US ) 14 June, when people fly the US flag. It is the anniversary of the day in 1777 when the Continental Congress passed a law making the Stars and Stripes the official American flag.
FLAG DAY
Meaning of FLAG DAY in English
Oxford guide to British and American culture English vocabulary. Руководство по британской и американской культуре, Оксфордский английский словарь. 2005