Oops, it doesn't look like 'open is day' is a national day..

Other days

pampering

Pampering Day
raise awerness of zeus

Raise Awerness Of Zeus Day
ponytail

Ponytail Day
tulip

Tulip Day
carpenters

Carpenters Day
self appreciation

Self Appreciation Day
hoodie

Hoodie Day
brow

Brow Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
me

Me Day