Oops, it doesn't look like 'historic landmark to host archaeology in action day' is a national day..

Other days

artists

Artists Day
pampering

Pampering Day
law

Law Day
chocolate milkshake

Chocolate Milkshake Day
self care

Self Care Day
me

Me Day
self appreciation

Self Appreciation Day
comfy

Comfy Day
hot chocolate

Hot Chocolate Day
blanket fort

Blanket Fort Day