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

Other days

brow

Brow Day
singles

Singles Day
ormille

Ormille Day
boy friend

Boy Friend Day
cat girl

Cat Girl Day
prosecco

Prosecco Day
believe

Believe Day
boba

Boba Day
bow tie

Bow Tie Day
ride the wind

Ride The Wind Day