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

Other days

boba

Boba Day
fiancee

Fiancee Day
self care

Self Care Day
cuddle up

Cuddle Up Day
youth

Youth Day
boy friend

Boy Friend Day
china

China Day
lumpy rug

Lumpy Rug Day
martini

Martini Day
buddy

Buddy Day