Oops, it doesn't look like 'flag on the eva of independence day' is a national day..

Other days

coffee

Coffee Day

youth

Youth Day

Me Day

first love

First Love Day

ormille

Ormille Day

brow

Brow Day

boba

Boba Day

bow tie

Bow Tie Day

tell a fairytale

Tell A Fairytale Day

slime

Slime Day