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

Other days

nae nae

Nae Nae Day
camera

Camera Day
youth

Youth Day
frozen yogurt

Frozen Yogurt Day
brow

Brow Day
law

Law Day
bubble bath

Bubble Bath Day
self appreciation

Self Appreciation Day
hannah

Hannah Day
china

China Day