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

Other days

comfy

Comfy Day
self care

Self Care Day
china

China Day
blanket fort

Blanket Fort Day
bow tie

Bow Tie Day
pick me

Pick Me Day
gum

Gum Day
lost sock memorial

Lost Sock Memorial Day
girl friend

Girl Friend Day
slime

Slime Day