Oops, it doesn't look like 'battlefield on a glorious spring day' is a national day..

Other days

coffee

Coffee Day
promposal

Promposal Day
one

One Day
brow

Brow Day
self appreciation

Self Appreciation Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
nae nae

Nae Nae Day
self care

Self Care Day
chocolate milkshake

Chocolate Milkshake Day
boy friend

Boy Friend Day