Oops, it doesn't look like 'happily single day' is a national day..

Other days

bounce

Bounce Day
cursing

Cursing Day
ormille

Ormille Day
china

China Day
youth

Youth Day
boy friend

Boy Friend Day
hannah

Hannah Day
kiss a ginger

Kiss A Ginger Day
nae nae

Nae Nae Day
ride the wind

Ride The Wind Day