Oops, it doesn't look like 'chocolate milkshake video game day' is a national day..

Other days

kale

Kale Day
stud

Stud Day
artists

Artists Day
lash

Lash Day
get funky

Get Funky Day
tell a fairytale

Tell A Fairytale Day
ruby

Ruby Day
cursing

Cursing Day
hoodie

Hoodie Day
gum

Gum Day