Oops, it doesn't look like 'new cases in a day' is a national day..

Other days

hot chocolate

Hot Chocolate Day
coffee

Coffee Day
self care

Self Care Day
kiss a brunette

Kiss A Brunette Day
boba

Boba Day
polyamory

Polyamory Day
artists

Artists Day
bow tie

Bow Tie Day
bounce

Bounce Day
law

Law Day