The Opernhaus Zürich in Switerland has announced in a public statement that they are limiting seating at the opera house due to the government's regulations surrounding the Coronavirus outbreak. The regulations state that there must be fewer than 1,000 people at a public and private events.
The statement is as follows,
"The canton doctor explicitly allowed events with fewer than 1000 people in the canton of Zurich. The performances planned at the Zurich Opera House will take place until further notice with a maximum of 900 spectators. We are constantly monitoring the situation and will inform you of news immediately in close consultation with the cantonal authorities." -Opernhaus Zürich
It appears that seating limitations will continue through till at least March 15, 2020, and possibly even later, as per a statement released by the opera house,
"For the first time, the Federal Council classifies the Coronavirus situation in Switzerland as a " special situation according to the Epidemic Act. That's why he now prohibits big events with more than 1000 people - private and public. The ban will applied until 15. March 2020-and can at best be extended. The implementation is in the hands of the cantons." -Opernhaus Zürich
Some cancellations have been made, including the opera ball planned for March 14, 2020.
"Unfortunately, we have to inform you that the opera ball planned for March 14., 2020 has to be cancelled due to the current situation. People who had purchased tickets for the Opera Ball will be contacted individually and informed about the further action."
To know if your attendance to a performance at Opernhaus Zürich is affected by limited seating or is all together cancelled, it is advised to contact the opera house directly.