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

Other days

kiss a brunette

Kiss A Brunette Day
bounce

Bounce Day
camera

Camera Day
my little pony

My Little Pony Day
cursing

Cursing Day
artists

Artists Day
aloxolt

Aloxolt Day
bubble bath

Bubble Bath Day
slime

Slime Day
bow tie

Bow Tie Day