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

Other days

tulip

Tulip Day
stud

Stud Day
pumpkin

Pumpkin Day
me

Me Day
coffee

Coffee Day
blanket fort

Blanket Fort Day
hoodie

Hoodie Day
bow tie

Bow Tie Day
singles

Singles Day
ruby

Ruby Day