Oops, it doesn't look like 'botanical garden for free on nelson mandela day' is a national day..

Other days

reading

Reading Day
unicorn

Unicorn Day
pumpkin

Pumpkin Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
hot chocolate

Hot Chocolate Day
martini

Martini Day
boy friend

Boy Friend Day
ride the wind

Ride The Wind Day
self appreciation

Self Appreciation Day
ask out your crush

Ask Out Your Crush Day