Oops, it doesn't look like 'pepperoni pepper roni day' is a national day..

Other days

self care

Self Care Day
get funky

Get Funky Day
cursing

Cursing Day
bow tie

Bow Tie Day
artists

Artists Day
china

China Day
bounce

Bounce Day
ride the wind

Ride The Wind Day
offer

Offer Day
unicorn

Unicorn Day