Oops, it doesn't look like 'embarrassment for at least one day' is a national day..

Other days

ponytail

Ponytail Day
nail polish

Nail Polish Day
pick me

Pick Me Day
gum

Gum Day
ask out your crush

Ask Out Your Crush Day
me

Me Day
embarrass your best friend

Embarrass Your Best Friend Day
kiss a ginger

Kiss A Ginger Day
offer

Offer Day
tell ur crush you like them

Tell Ur Crush You Like Them Day