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

Other days

cat girl

Cat Girl Day
cuddle up

Cuddle Up Day
slime

Slime Day
offer

Offer Day
coffee

Coffee Day
prosecco

Prosecco Day
eat what you want

Eat What You Want Day
camera

Camera Day
pampering

Pampering Day
blanket fort

Blanket Fort Day