flag day
noun /ˈflæɡ deɪ/
/ˈflæɡ deɪ/
- (British English) a day when money is collected in public places for a charity, and people who give money receive a small paper sticker
募捐售旗日 - Flag Day14 June, the anniversary of the day in 1777 when the Stars and Stripes became the national flag of the United States
美国国旗纪念日（6 月 14 日）