Oops, it doesn't look like 'hungover from tequila day' is a national day..

Other days

bounce

Bounce Day
kale

Kale Day
kiss a ginger

Kiss A Ginger Day
slime

Slime Day
nae nae

Nae Nae Day
bow tie

Bow Tie Day
donate your hair

Donate Your Hair Day
boba

Boba Day
singles

Singles Day
hoodie

Hoodie Day