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

Other days

kiss a ginger

Kiss A Ginger Day
bubble bath

Bubble Bath Day
one

One Day
artists

Artists Day
stud

Stud Day
prosecco

Prosecco Day
nae nae

Nae Nae Day
bow tie

Bow Tie Day
ride the wind

Ride The Wind Day
boy friend

Boy Friend Day