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

Other days

comfy

Comfy Day
ponytail

Ponytail Day
bow tie

Bow Tie Day
hiv awareness

Hiv Awareness Day
my little pony

My Little Pony Day
unicorn

Unicorn Day
stud

Stud Day
cat girl

Cat Girl Day
lumpy rug

Lumpy Rug Day
offer

Offer Day