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

Other days

slime

Slime Day
singles

Singles Day
ask out your crush

Ask Out Your Crush Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
lisp

Lisp Day
hiv awareness

Hiv Awareness Day
artists

Artists Day
aloxolt

Aloxolt Day
tell a fairytale

Tell A Fairytale Day
buddy

Buddy Day