Oops, it doesn't look like 'have a coke jumbo jack day' is a national day..

Other days

cursing

Cursing Day
pick me

Pick Me Day
get funky

Get Funky Day
stud

Stud Day
comfy

Comfy Day
frozen yogurt

Frozen Yogurt Day
aloxolt

Aloxolt Day
ormille

Ormille Day
buddy

Buddy Day
one

One Day