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

Other days

fiancee

Fiancee Day
cuddle up

Cuddle Up Day
tell a fairytale

Tell A Fairytale Day
brow

Brow Day
boy friend

Boy Friend Day
self care

Self Care Day
eat what you want

Eat What You Want Day
kale

Kale Day
azonto is acceptable

Azonto Is Acceptable Day
me

Me Day