Is this allowed under current Covid restrictions?

I was touched but not surprised that, despite his illness, the King attended the 80th anniversary of the ‘liberation’ of Auschwitz-Birkenau this week. His paternal grandmother, Princess Alice of Battenberg, was a rescuer. She hid the Cohen family in her house in Athens and is honoured as a ‘righteous’ gentile at Yad Vashem in Jerusalem,