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

Other days

boba

Boba Day
first love

First Love Day
my little pony

My Little Pony Day
hot chocolate

Hot Chocolate Day
healing

Healing Day
ruby

Ruby Day
bow tie

Bow Tie Day
offer

Offer Day
polyamory

Polyamory Day
ponytail

Ponytail Day