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

Other days

boyfriend

Boyfriend Day
law

Law Day
ruby

Ruby Day
chocolate milkshake

Chocolate Milkshake Day
ormille

Ormille Day
aloxolt

Aloxolt Day
ask out your crush

Ask Out Your Crush Day
nae nae

Nae Nae Day
bow tie

Bow Tie Day
lisp

Lisp Day