Oops, it doesn't look like 'hero to this day' is a national day..

Other days

brow

Brow Day
ride the wind

Ride The Wind Day
nae nae

Nae Nae Day
boba

Boba Day
self care

Self Care Day
youth

Youth Day
coffee

Coffee Day
promposal

Promposal Day
tell a fairytale

Tell A Fairytale Day
offer

Offer Day