Oops, it doesn't look like 'weed fail your drug test day' is a national day..

Other days

pumpkin

Pumpkin Day
blanket fort

Blanket Fort Day
comfy

Comfy Day
stud

Stud Day
china

China Day
slime

Slime Day
gum

Gum Day
kale

Kale Day
buddy

Buddy Day
artists

Artists Day