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

Other days

comfy

Comfy Day
self appreciation

Self Appreciation Day
lisp

Lisp Day
self care

Self Care Day
cuddle up

Cuddle Up Day
boba

Boba Day
nae nae

Nae Nae Day
emoji

Emoji Day
fiancee

Fiancee Day
offer

Offer Day