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

Other days

lash

Lash Day
nae nae

Nae Nae Day
boy friend

Boy Friend Day
tulip

Tulip Day
kale

Kale Day
eat what you want

Eat What You Want Day
donate your hair

Donate Your Hair Day
hoodie

Hoodie Day
carpenters

Carpenters Day
china

China Day