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

Other days

ruby

Ruby Day
lisp

Lisp Day
polyamory

Polyamory Day
china

China Day
first love

First Love Day
one

One Day
nae nae

Nae Nae Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
martini

Martini Day
kale

Kale Day