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

Other days

singles

Singles Day
comfy

Comfy Day
carpenters

Carpenters Day
eat what you want

Eat What You Want Day
fiancee

Fiancee Day
boy friend

Boy Friend Day
bow tie

Bow Tie Day
china

China Day
bounce

Bounce Day
tulip

Tulip Day