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

Other days

buddy

Buddy Day
tulip

Tulip Day
kiss a brunette

Kiss A Brunette Day
kale

Kale Day
coffee

Coffee Day
ruby

Ruby Day
pick me

Pick Me Day
polyamory

Polyamory Day
boy friend

Boy Friend Day
first love

First Love Day