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

Other days

coffee

Coffee Day
unicorn

Unicorn Day
tulip

Tulip Day
first love

First Love Day
ride the wind

Ride The Wind Day
healing

Healing Day
azonto is acceptable

Azonto Is Acceptable Day
aloxolt

Aloxolt Day
self care

Self Care Day
gum

Gum Day