According to Government Council Resolution No. 27/2022 of March 9, 2022, to access cultural events, it is mandatory to use mask. It is no longer mandatory to present certificate of vaccination and/or negative test result.
https://portal.azores.gov.pt/web/comunicacao/news-detail?id=6195923&fbclid=IwAR2HCNQ7vQSCRnxl9aFM0ZeSM3gxaX4Bf2EM00GE0KpJLcBT9XmA7MyaEBM