Oops, it doesn't look like 'happy pabebe wave day' is a national day..

Other days

boyfriend

Boyfriend Day
brow

Brow Day
nae nae

Nae Nae Day
ruby

Ruby Day
fiancee

Fiancee Day
cuddle up

Cuddle Up Day
donate your hair

Donate Your Hair Day
girl friend

Girl Friend Day
slime

Slime Day
hannah

Hannah Day