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

Other days

ponytail

Ponytail Day
kiss a brunette

Kiss A Brunette Day
bounce

Bounce Day
lash

Lash Day
self care

Self Care Day
lisp

Lisp Day
brow

Brow Day
china

China Day
cat girl

Cat Girl Day
boba

Boba Day