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

Other days

nae nae

Nae Nae Day

Emoji Day

self appreciation

Self Appreciation Day

first love

First Love Day

prosecco

Prosecco Day

coffee

Coffee Day

comfy

Comfy Day

boy friend

Boy Friend Day

donate your hair

Donate Your Hair Day

polyamory

Polyamory Day