Oops, it doesn't look like 'get to embarrass your best friend day' is a national day..

Other days

nail polish

Nail Polish Day
china

China Day
boy friend

Boy Friend Day
aloxolt

Aloxolt Day
first love

First Love Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
self appreciation

Self Appreciation Day
polyamory

Polyamory Day
embarrass your best friend

Embarrass Your Best Friend Day
hoodie

Hoodie Day