Oops, it doesn't look like 'wwii museum hosts memorial day' is a national day..

Other days

promposal

Promposal Day
lumpy rug

Lumpy Rug Day
lost sock memorial

Lost Sock Memorial Day
bounce

Bounce Day
chocolate milkshake

Chocolate Milkshake Day
self appreciation

Self Appreciation Day
blanket fort

Blanket Fort Day
boyfriend

Boyfriend Day
stud

Stud Day
first love

First Love Day