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

Other days

buddy

Buddy Day
pumpkin

Pumpkin Day
one

One Day
boy friend

Boy Friend Day
latina equal pay

Latina Equal Pay Day
first love

First Love Day
brow

Brow Day
tell a fairytale

Tell A Fairytale Day
lisp

Lisp Day
camera

Camera Day