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

Other days

pampering

Pampering Day
offer

Offer Day
bow tie

Bow Tie Day
boy friend

Boy Friend Day
girl friend

Girl Friend Day
self appreciation

Self Appreciation Day
buddy

Buddy Day
tell a fairytale

Tell A Fairytale Day
me

Me Day
azonto is acceptable

Azonto Is Acceptable Day