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

Other days

nae nae

Nae Nae Day
blanket fort

Blanket Fort Day
boy friend

Boy Friend Day
coffee

Coffee Day
artists

Artists Day
bonang

Bonang Day
hiv awareness

Hiv Awareness Day
hannah

Hannah Day
lisp

Lisp Day
pampering

Pampering Day