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

Other days

coffee

Coffee Day
aloxolt

Aloxolt Day
hannah

Hannah Day
book

Book Day
artists

Artists Day
eat what you want

Eat What You Want Day
one

One Day
kale

Kale Day
nae nae

Nae Nae Day
get funky

Get Funky Day