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

Other days

kale

Kale Day
lash

Lash Day
latina equal pay

Latina Equal Pay Day
ponytail

Ponytail Day
get funky

Get Funky Day
me

Me Day
frozen yogurt

Frozen Yogurt Day
nae nae

Nae Nae Day
bow tie

Bow Tie Day
coffee

Coffee Day