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

Other days

azonto is acceptable

Azonto Is Acceptable Day
ruby

Ruby Day
nae nae

Nae Nae Day
artists

Artists Day
cursing

Cursing Day
stud

Stud Day
mean girls

Mean Girls Day
fiancee

Fiancee Day
buddy

Buddy Day
unicorn

Unicorn Day