Oops, it doesn't look like 'underwear breathe in and out day' is a national day..

Other days

boba

Boba Day
gum

Gum Day
hannah

Hannah Day
offer

Offer Day
pick me

Pick Me Day
ride the wind

Ride The Wind Day
bow tie

Bow Tie Day
youth

Youth Day
cat girl

Cat Girl Day
healing

Healing Day