Oops, it doesn't look like 'flag during the oxi day' is a national day..

Other days

kale

Kale Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
self appreciation

Self Appreciation Day
hiv awareness

Hiv Awareness Day
latina equal pay

Latina Equal Pay Day
hoodie

Hoodie Day
gum

Gum Day
martini

Martini Day
me

Me Day
embarrass your best friend

Embarrass Your Best Friend Day