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

Other days

healing

Healing Day
cuddle up

Cuddle Up Day
prosecco

Prosecco Day
gum

Gum Day
ask out your crush

Ask Out Your Crush Day
buddy

Buddy Day
nae nae

Nae Nae Day
believe

Believe Day
bounce

Bounce Day
slime

Slime Day