Oops, it doesn't look like 'flags are sold in market on large scale on the occasion of independence day' is a national day..

Other days

Appreciate Yaself A Lil Extra Day

Cat Girl Day

Nae Nae Day

Offer Day

Gum Day

Boba Day

Tell A Fairytale Day

Stress Awareness Day

Frozen Yogurt Day

Lost Sock Memorial Day