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

Other days

frozen yogurt

Frozen Yogurt Day
nail polish

Nail Polish Day
hoodie

Hoodie Day
china

China Day
slime

Slime Day
cat girl

Cat Girl Day
eat what you want

Eat What You Want Day
stud

Stud Day
kale

Kale Day
lisp

Lisp Day