Oops, it doesn't look like 'bike monthchallenge yourself to commute to work one day' is a national day..

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
hiv awareness

Hiv Awareness Day
stress awareness

Stress Awareness Day
boba

Boba Day
hot chocolate

Hot Chocolate Day
eat what you want

Eat What You Want Day
carpenters

Carpenters Day
comfy

Comfy Day
raise awerness of zeus

Raise Awerness Of Zeus Day
prescription drug take back

Prescription Drug Take Back Day