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

Other days

cursing

Cursing Day
ruby

Ruby Day
slime

Slime Day
latina equal pay

Latina Equal Pay Day
tulip

Tulip Day
blanket fort

Blanket Fort Day
tell a fairytale

Tell A Fairytale Day
stud

Stud Day
nail polish

Nail Polish Day
pampering

Pampering Day