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

Other days

gum

Gum Day
cuddle up

Cuddle Up Day
hannah

Hannah Day
buddy

Buddy Day
self appreciation

Self Appreciation Day
artists

Artists Day
bow tie

Bow Tie Day
nae nae

Nae Nae Day
china

China Day
polyamory

Polyamory Day