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

Other days

kale

Kale Day
believe

Believe Day
book

Book Day
bow tie

Bow Tie Day
nae nae

Nae Nae Day
self appreciation

Self Appreciation Day
special education

Special Education Day
ruby

Ruby Day
camera

Camera Day
carpenters

Carpenters Day