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

Other days

bounce

Bounce Day
boy friend

Boy Friend Day
pumpkin

Pumpkin Day
aloxolt

Aloxolt Day
gum

Gum Day
latina equal pay

Latina Equal Pay Day
ride the wind

Ride The Wind Day
ruby

Ruby Day
hoodie

Hoodie Day
kiss a ginger

Kiss A Ginger Day