A performance of Giuseppe Verdi’s “Un Ballo in Maschera” at the Teatro Real was canceled after spectators spent more than an hour shouting and clapping to protest against what they said were insufficient social distancing measures in the opera house’s mezzanine levels. Photos and videos shared on social media showed filled rows in the upper sections of the house, in contrast to the orchestra level of the auditorium, where spectators were separated by vacant seats. – The New York Times