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

Other days

bounce

Bounce Day
gum

Gum Day
ormille

Ormille Day
singles

Singles Day
healing

Healing Day
ask out your crush

Ask Out Your Crush Day
kiss a brunette

Kiss A Brunette Day
lumpy rug

Lumpy Rug Day
cuddle up

Cuddle Up Day
slime

Slime Day