Oops, it doesn't look like 'perfect hairline day' is a national day..

Other days

artists

Artists Day
azonto is acceptable

Azonto Is Acceptable Day
lash

Lash Day
kale

Kale Day
bow tie

Bow Tie Day
bounce

Bounce Day
hoodie

Hoodie Day
my little pony

My Little Pony Day
gum

Gum Day
believe

Believe Day