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

Other days

offer

Offer Day
blanket fort

Blanket Fort Day
get funky

Get Funky Day
self appreciation

Self Appreciation Day
china

China Day
eat what you want

Eat What You Want Day
lumpy rug

Lumpy Rug Day
ormille

Ormille Day
bounce

Bounce Day
law

Law Day