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

Other days

lash

Lash Day
buddy

Buddy Day
bubble bath

Bubble Bath Day
brow

Brow Day
bonang

Bonang Day
self care

Self Care Day
one

One Day
polyamory

Polyamory Day
nae nae

Nae Nae Day
youth

Youth Day