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

Other days

aloxolt

Aloxolt Day
buddy

Buddy Day
first love

First Love Day
chocolate milkshake

Chocolate Milkshake Day
bow tie

Bow Tie Day
artists

Artists Day
lost sock memorial

Lost Sock Memorial Day
pumpkin

Pumpkin Day
offer

Offer Day
gum

Gum Day