Open days of historic monuments and heritage sites (including many buildings normally closed to the general public).
Programme available here : https://www.strasbourg.eu/documents/976405/1163507/0/8b02a422-a511-e78c-5ace-d29fffcec7ed.
To access most leisure and cultures events, you must present a EU health pass.
More information on the health pass here.
If you are coming outside of the EU and are fully vaccinated, you can apply for a COVID vaccine certificate of equivalence.