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

Other days

cursing

Cursing Day
law

Law Day
youth

Youth Day
pumpkin

Pumpkin Day
boy friend

Boy Friend Day
blanket fort

Blanket Fort Day
frozen yogurt

Frozen Yogurt Day
boba

Boba Day
bubble bath

Bubble Bath Day
get funky

Get Funky Day