Oops, it doesn't look like 'championship on alumni day' is a national day..

Other days

prosecco

Prosecco Day
tell a fairytale

Tell A Fairytale Day
healing

Healing Day
one

One Day
bow tie

Bow Tie Day
mean girls

Mean Girls Day
ruby

Ruby Day
offer

Offer Day
kale

Kale Day
ponytail

Ponytail Day