From the Zurich Opera website on 22 April 2021:
“We unfortunately must announce that we will not be able to continue with our originally scheduled season. Opera and ballet performances are art forms with high personnel numbers, with some 150-200 individuals working each evening. It is not possible to justify performances with a small seating capacity. It is for this reason, and with the long lead times required to plan productions in mind, that we regretfully announce that we have decided, in consultation with the Canton of Zurich, to cancel our regular schedule through the end of the season.”