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

Other days

buddy

Buddy Day
gum

Gum Day
cursing

Cursing Day
slime

Slime Day
boy friend

Boy Friend Day
self appreciation

Self Appreciation Day
aloxolt

Aloxolt Day
singles

Singles Day
tulip

Tulip Day
boba

Boba Day