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

Other days

boyfriend

Boyfriend Day
buddy

Buddy Day
stud

Stud Day
hannah

Hannah Day
embarrass your best friend

Embarrass Your Best Friend Day
self care

Self Care Day
blanket fort

Blanket Fort Day
self appreciation

Self Appreciation Day
me

Me Day
boy friend

Boy Friend Day