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

Other days

cursing

Cursing Day
believe

Believe Day
my little pony

My Little Pony Day
coffee

Coffee Day
china

China Day
pick me

Pick Me Day
eat what you want

Eat What You Want Day
comfy

Comfy Day
lisp

Lisp Day
youth

Youth Day