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

Other days

frozen yogurt

Frozen Yogurt Day
polyamory

Polyamory Day
camera

Camera Day
ruby

Ruby Day
cuddle up

Cuddle Up Day
bubble bath

Bubble Bath Day
aloxolt

Aloxolt Day
cursing

Cursing Day
boy friend

Boy Friend Day
lumpy rug

Lumpy Rug Day