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

Other days

slime

Slime Day
cuddle up

Cuddle Up Day
coffee

Coffee Day
lisp

Lisp Day
kiss a brunette

Kiss A Brunette Day
blanket fort

Blanket Fort Day
tell a fairytale

Tell A Fairytale Day
nae nae

Nae Nae Day
bounce

Bounce Day
brow

Brow Day