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

Other days

martini

Martini Day
donate your hair

Donate Your Hair Day
book

Book Day
bubble bath

Bubble Bath Day
unicorn

Unicorn Day
bonang

Bonang Day
cat girl

Cat Girl Day
stud

Stud Day
azonto is acceptable

Azonto Is Acceptable Day
lisp

Lisp Day