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

Other days

kiss a ginger

Kiss A Ginger Day
polyamory

Polyamory Day
prosecco

Prosecco Day
bonang

Bonang Day
youth

Youth Day
artists

Artists Day
one

One Day
bow tie

Bow Tie Day
lost sock memorial

Lost Sock Memorial Day
tulip

Tulip Day