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

Other days

tulip

Tulip Day
promposal

Promposal Day
self care

Self Care Day
polyamory

Polyamory Day
lumpy rug

Lumpy Rug Day
law

Law Day
slime

Slime Day
tell a fairytale

Tell A Fairytale Day
lash

Lash Day
kale

Kale Day