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

Other days

fiancee

Fiancee Day
pampering

Pampering Day
comfy

Comfy Day
blanket fort

Blanket Fort Day
singles

Singles Day
hoodie

Hoodie Day
kiss a ginger

Kiss A Ginger Day
polyamory

Polyamory Day
ruby

Ruby Day
one

One Day