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

Other days

pick me

Pick Me Day
fiancee

Fiancee Day
china

China Day
bow tie

Bow Tie Day
donate your hair

Donate Your Hair Day
latina equal pay

Latina Equal Pay Day
get funky

Get Funky Day
bonang

Bonang Day
one

One Day
self care

Self Care Day