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

Other days

fiancee

Fiancee Day
believe

Believe Day
first love

First Love Day
bow tie

Bow Tie Day
kale

Kale Day
boba

Boba Day
offer

Offer Day
artists

Artists Day
my little pony

My Little Pony Day
eat what you want

Eat What You Want Day