Oops, it doesn't look like 'records for most blood donations in one day' is a national day..

Other days

girl friend

Girl Friend Day
carpenters

Carpenters Day
boy friend

Boy Friend Day
reading

Reading Day
frozen yogurt

Frozen Yogurt Day
hoodie

Hoodie Day
ask out your crush

Ask Out Your Crush Day
me

Me Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
self appreciation

Self Appreciation Day