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

Other days

cursing

Cursing Day
slime

Slime Day
ormille

Ormille Day
self care

Self Care Day
cuddle up

Cuddle Up Day
eat what you want

Eat What You Want Day
unicorn

Unicorn Day
hoodie

Hoodie Day
pampering

Pampering Day
kale

Kale Day