Oops, it doesn't look like 'british flag day' is a national day..

Other days

camera

Camera Day
hiv awareness

Hiv Awareness Day
azonto is acceptable

Azonto Is Acceptable Day
mean girls

Mean Girls Day
brow

Brow Day
offer

Offer Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
tell a fairytale

Tell A Fairytale Day
fiancee

Fiancee Day