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

Other days

eat what you want

Eat What You Want Day
kale

Kale Day
reading

Reading Day
boyfriend

Boyfriend Day
nae nae

Nae Nae Day
one

One Day
brow

Brow Day
lumpy rug

Lumpy Rug Day
lisp

Lisp Day
pampering

Pampering Day