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

Other days

pampering

Pampering Day
healing

Healing Day
one

One Day
comfy

Comfy Day
buddy

Buddy Day
lisp

Lisp Day
my little pony

My Little Pony Day
ponytail

Ponytail Day
youth

Youth Day
bonang

Bonang Day