Oops, it doesn't look like 'act like an idiot day' is a national day..

Other days

ruby

Ruby Day
bounce

Bounce Day
boba

Boba Day
nae nae

Nae Nae Day
slime

Slime Day
fiancee

Fiancee Day
one

One Day
gum

Gum Day
stress awareness

Stress Awareness Day
kiss a brunette

Kiss A Brunette Day