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

Other days

comfy

Comfy Day
frozen yogurt

Frozen Yogurt Day
artists

Artists Day
self appreciation

Self Appreciation Day
bow tie

Bow Tie Day
pumpkin

Pumpkin Day
polyamory

Polyamory Day
ruby

Ruby Day
first love

First Love Day
book

Book Day