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

Other days

promposal

Promposal Day
pumpkin

Pumpkin Day
hiv awareness

Hiv Awareness Day
lisp

Lisp Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
boyfriend

Boyfriend Day
boba

Boba Day
my little pony

My Little Pony Day
blanket fort

Blanket Fort Day
boy friend

Boy Friend Day