Oops, it doesn't look like 'flag is hoisted every year on independence day' is a national day..

Other days

special education

Special Education Day
boba

Boba Day
self appreciation

Self Appreciation Day
bow tie

Bow Tie Day
camera

Camera Day
embarrass your best friend

Embarrass Your Best Friend Day
boy friend

Boy Friend Day
boyfriend

Boyfriend Day
ask out your crush

Ask Out Your Crush Day
hiv awareness

Hiv Awareness Day