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

Other days

unicorn

Unicorn Day
my little pony

My Little Pony Day
offer

Offer Day
boyfriend

Boyfriend Day
bonang

Bonang Day
ask out your crush

Ask Out Your Crush Day
boy friend

Boy Friend Day
bow tie

Bow Tie Day
hannah

Hannah Day
lash

Lash Day