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

Other days

artists

Artists Day
slime

Slime Day
special education

Special Education Day
boy friend

Boy Friend Day
ormille

Ormille Day
first love

First Love Day
mean girls

Mean Girls Day
bounce

Bounce Day
polyamory

Polyamory Day
ponytail

Ponytail Day