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

Other days

boba

Boba Day
kale

Kale Day
donate your hair

Donate Your Hair Day
mean girls

Mean Girls Day
singles

Singles Day
fiancee

Fiancee Day
bow tie

Bow Tie Day
emoji

Emoji Day
ask out your crush

Ask Out Your Crush Day
lumpy rug

Lumpy Rug Day