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

Other days

tulip

Tulip Day
hoodie

Hoodie Day
comfy

Comfy Day
healing

Healing Day
first love

First Love Day
cuddle up

Cuddle Up Day
law

Law Day
stud

Stud Day
ormille

Ormille Day
frozen yogurt

Frozen Yogurt Day