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

Other days

bow tie

Bow Tie Day
blanket fort

Blanket Fort Day
cuddle up

Cuddle Up Day
stud

Stud Day
carpenters

Carpenters Day
comfy

Comfy Day
gum

Gum Day
eat what you want

Eat What You Want Day
law

Law Day
tulip

Tulip Day