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

Other days

china

China Day
hannah

Hannah Day
azonto is acceptable

Azonto Is Acceptable Day
first love

First Love Day
girl friend

Girl Friend Day
gum

Gum Day
martini

Martini Day
cat girl

Cat Girl Day
bubble bath

Bubble Bath Day
slime

Slime Day