Oops, it doesn't look like 'societies poster contributions for the international pathology day' is a national day..

Other days

fiancee

Fiancee Day

Me Day

nae nae

Nae Nae Day

cursing

Cursing Day

self appreciation

Self Appreciation Day

bow tie

Bow Tie Day

book

Book Day

embarrass your best friend

Embarrass Your Best Friend Day

boy friend

Boy Friend Day

ride the wind

Ride The Wind Day