Oops, it doesn't look like 'cemetery preparation for memorial day' is a national day..

Other days

lisp

Lisp Day

boba

Boba Day

blanket fort

Blanket Fort Day

self appreciation

Self Appreciation Day

girl friend

Girl Friend Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day

cursing

Cursing Day

tell ur crush you like them

Tell Ur Crush You Like Them Day

Emoji Day

my little pony

My Little Pony Day