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

Other days

unicorn

Unicorn Day
lumpy rug

Lumpy Rug Day
blanket fort

Blanket Fort Day
nail polish

Nail Polish Day
first love

First Love Day
kale

Kale Day
nae nae

Nae Nae Day
hannah

Hannah Day
boy friend

Boy Friend Day
book

Book Day