Oops, it doesn't look like 'flag should be flown on st andrews day' is a national day..

Other days

polyamory

Polyamory Day
first love

First Love Day
fiancee

Fiancee Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
cursing

Cursing Day
me

Me Day
nail polish

Nail Polish Day
promposal

Promposal Day
ask out your crush

Ask Out Your Crush Day
raise awerness of zeus

Raise Awerness Of Zeus Day