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

Other days

offer

Offer Day
cuddle up

Cuddle Up Day
kale

Kale Day
blanket fort

Blanket Fort Day
lash

Lash Day
kiss a brunette

Kiss A Brunette Day
artists

Artists Day
self appreciation

Self Appreciation Day
camera

Camera Day
buddy

Buddy Day