From February 12, theatres in St. Petersburg are able to sell 75% of the total number of tickets on sale. The resolution of the Government of St. Petersburg dated as of February 10, 2021 No. 1 was signed by the Governor of the city Alexander Beglov.
This means that the St. Petersburg Opera will be able to open sales for additional seats. We look forward to meeting you, dear viewers, however, please do not forget about the rules for visiting the theatre, which operate in accordance with the “Measures to Counter the Spread of a New Coronavirus Infection (COVID-19) in St. Petersburg". The standard was approved by the Federal Service for Surveillance on Consumer Rights Protection and Human Welfare.
You can read the rules here - https://www.spbopera.ru/novosty/2020-10/444-pravila-p..