Oops, it doesn't look like 'hero and one day' is a national day..

Other days

comfy

Comfy Day
frozen yogurt

Frozen Yogurt Day
bow tie

Bow Tie Day
donate your hair

Donate Your Hair Day
ormille

Ormille Day
me

Me Day
self care

Self Care Day
lumpy rug

Lumpy Rug Day
azonto is acceptable

Azonto Is Acceptable Day
my little pony

My Little Pony Day