Oops, it doesn't look like 'museum of the united states army opened day' is a national day..

Other days

tulip

Tulip Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
kale

Kale Day
mean girls

Mean Girls Day
self care

Self Care Day
stress awareness

Stress Awareness Day
youth

Youth Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
self appreciation

Self Appreciation Day
pick me

Pick Me Day