Oops, it doesn't look like 'call to lower us flags on memorial day' is a national day..

Other days

hoodie

Hoodie Day
aloxolt

Aloxolt Day
get funky

Get Funky Day
lisp

Lisp Day
law

Law Day
ponytail

Ponytail Day
bonang

Bonang Day
lash

Lash Day
offer

Offer Day
ruby

Ruby Day