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

Other days

martini

Martini Day
tell a fairytale

Tell A Fairytale Day
stud

Stud Day
law

Law Day
lumpy rug

Lumpy Rug Day
bow tie

Bow Tie Day
china

China Day
emoji

Emoji Day
bubble bath

Bubble Bath Day
my little pony

My Little Pony Day