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

Other days

ruby

Ruby Day
bow tie

Bow Tie Day
ormille

Ormille Day
azonto is acceptable

Azonto Is Acceptable Day
healing

Healing Day
book

Book Day
self care

Self Care Day
comfy

Comfy Day
slime

Slime Day
my little pony

My Little Pony Day