Oops, it doesn't look like 'heroes herpes day' is a national day..

Other days

brow

Brow Day
frozen yogurt

Frozen Yogurt Day
eat what you want

Eat What You Want Day
youth

Youth Day
tulip

Tulip Day
me

Me Day
comfy

Comfy Day
first love

First Love Day
slime

Slime Day
pick me

Pick Me Day