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

Other days

believe

Believe Day
raise awerness of zeus

Raise Awerness Of Zeus Day
buddy

Buddy Day
mean girls

Mean Girls Day
one

One Day
cuddle up

Cuddle Up Day
boba

Boba Day
martini

Martini Day
slime

Slime Day
self care

Self Care Day