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

Other days

aloxolt

Aloxolt Day
pick me

Pick Me Day
bow tie

Bow Tie Day
artists

Artists Day
singles

Singles Day
slime

Slime Day
lisp

Lisp Day
stud

Stud Day
believe

Believe Day
chocolate milkshake

Chocolate Milkshake Day