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

Other days

hannah

Hannah Day
pumpkin

Pumpkin Day
stud

Stud Day
get funky

Get Funky Day
latina equal pay

Latina Equal Pay Day
bounce

Bounce Day
frozen yogurt

Frozen Yogurt Day
boy friend

Boy Friend Day
boba

Boba Day
first love

First Love Day