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

Other days

kale

Kale Day
lisp

Lisp Day
donate your hair

Donate Your Hair Day
comfy

Comfy Day
prosecco

Prosecco Day
promposal

Promposal Day
girl friend

Girl Friend Day
latina equal pay

Latina Equal Pay Day
nae nae

Nae Nae Day
ponytail

Ponytail Day