No events with more than 50 participants*.
The Berlin Senate decided on 14 March 2020 that with immediate effect all public and non-public events in Berlin are prohibited for 50 participants or more.
For public and non-public events with up to 50 participants, the organizer must keep an attendance list containing name, address, postal address and telephone number. This list must be kept for at least four weeks and must be handed over in full at the request of the Health Office.
More information can be found in the press release of the Berliner Senatskanzlei (in German).