Oops, it doesn't look like 'page be wave day' is a national day..

Other days

coffee

Coffee Day
slime

Slime Day
eat what you want

Eat What You Want Day
bonang

Bonang Day
stud

Stud Day
tulip

Tulip Day
boyfriend

Boyfriend Day
tell a fairytale

Tell A Fairytale Day
bow tie

Bow Tie Day
law

Law Day