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

Other days

polyamory

Polyamory Day
coffee

Coffee Day
cursing

Cursing Day
youth

Youth Day
china

China Day
singles

Singles Day
cuddle up

Cuddle Up Day
promposal

Promposal Day
boy friend

Boy Friend Day
kiss a ginger

Kiss A Ginger Day