March 16, 2021 Day
This is he anniversary of St. Philip Neri's miracle of raising the young Paolo Massimo from the dead.
The home in Rome where it occurred is private, belonging to the Massimo family, and is open to the public just 1 day per year. Dignitaries, priests and Bishops (as well as some Cardinals) are allowed in this day and Mass is celebrated.
You can read the story here.