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

Other days

camera

Camera Day
polyamory

Polyamory Day
bubble bath

Bubble Bath Day
donate your hair

Donate Your Hair Day
artists

Artists Day
cuddle up

Cuddle Up Day
boba

Boba Day
brow

Brow Day
law

Law Day
cat girl

Cat Girl Day