Oops, it doesn't look like 'tell her no day' is a national day..

Other days

boy friend

Boy Friend Day
ruby

Ruby Day
prosecco

Prosecco Day
emoji

Emoji Day
tell a fairytale

Tell A Fairytale Day
slime

Slime Day
nae nae

Nae Nae Day
self care

Self Care Day
cursing

Cursing Day
mean girls

Mean Girls Day