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

Other days

china

China Day
tulip

Tulip Day
mean girls

Mean Girls Day
ask out your crush

Ask Out Your Crush Day
lumpy rug

Lumpy Rug Day
self care

Self Care Day
bonang

Bonang Day
get funky

Get Funky Day
cat girl

Cat Girl Day
slime

Slime Day