Oops, it doesn't look like 'newsletter for greek day' is a national day..

Other days

kale

Kale Day
nae nae

Nae Nae Day
bow tie

Bow Tie Day
coffee

Coffee Day
book

Book Day
lash

Lash Day
bubble bath

Bubble Bath Day
artists

Artists Day
self appreciation

Self Appreciation Day
hoodie

Hoodie Day