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

Other days

fiancee

Fiancee Day
blanket fort

Blanket Fort Day
self care

Self Care Day
lumpy rug

Lumpy Rug Day
carpenters

Carpenters Day
buddy

Buddy Day
stud

Stud Day
cursing

Cursing Day
singles

Singles Day
believe

Believe Day