Oops, it doesn't look like 'flags have turned out in large numbers on day' is a national day..

Other days

Embarrass Your Best Friend Day

Me Day

Hot Chocolate Day

Bubble Bath Day

Fiancee Day

Tell Ur Crush You Like Them Day

Ormille Day

Tulip Day

Ride The Wind Day

African Immigrant And Refugee Hiv And Hep Awareness Day