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

Other days

singles

Singles Day
ask out your crush

Ask Out Your Crush Day
coffee

Coffee Day
lisp

Lisp Day
nail polish

Nail Polish Day
book

Book Day
polyamory

Polyamory Day
nae nae

Nae Nae Day
first love

First Love Day
brow

Brow Day