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

Other days

lisp

Lisp Day
blanket fort

Blanket Fort Day
gum

Gum Day
pick me

Pick Me Day
nail polish

Nail Polish Day
lash

Lash Day
ruby

Ruby Day
believe

Believe Day
raise awerness of zeus

Raise Awerness Of Zeus Day
bow tie

Bow Tie Day