Oops, it doesn't look like 'blow the whole school day' is a national day..

Other days

slime

Slime Day
buddy

Buddy Day
pampering

Pampering Day
kiss a ginger

Kiss A Ginger Day
one

One Day
comfy

Comfy Day
kale

Kale Day
ruby

Ruby Day
lost sock memorial

Lost Sock Memorial Day
bow tie

Bow Tie Day