Oops, it doesn't look like 'flag will be flown at half mast throughout india on the day' is a national day..

Other days

Kale Day

Lash Day

Ruby Day

Tell Ur Crush You Like Them Day

Lumpy Rug Day

Frozen Yogurt Day

Prosecco Day

Latina Equal Pay Day

Nae Nae Day

Ormille Day