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

Other days

cursing

Cursing Day
lash

Lash Day
camera

Camera Day
blanket fort

Blanket Fort Day
boba

Boba Day
bow tie

Bow Tie Day
special education

Special Education Day
ponytail

Ponytail Day
artists

Artists Day
cuddle up

Cuddle Up Day