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

Other days

ruby

Ruby Day
coffee

Coffee Day
self appreciation

Self Appreciation Day
eat what you want

Eat What You Want Day
lisp

Lisp Day
offer

Offer Day
reading

Reading Day
prosecco

Prosecco Day
gum

Gum Day
ormille

Ormille Day