Oops, it doesn't look like 'guard members fearing possible insider attack on inauguration day' is a national day..

Other days

hiv awareness

Hiv Awareness Day
embarrass your best friend

Embarrass Your Best Friend Day
unicorn

Unicorn Day
cursing

Cursing Day
kiss a ginger

Kiss A Ginger Day
gum

Gum Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
artists

Artists Day
slime

Slime Day
lost sock memorial

Lost Sock Memorial Day