https://www.reuters.com/sports/france-prepared-change-plans-2024-olympics-opening-based-security-2023-12-20/

Because of the safety concerns related to hosting the opening ceremony in a non enclosed area like a stadium, Paris Olympics officials have shared that alternate plans exist for the opening ceremony.

The market will resolve as Yes if the opening ceremony takes place on the Seine river, with national teams positioned on separate boats, floating at least from Pont d’Austerlitz to Pont d‘Iéna.

Any other alternatives will resolve as No, even if teams float for example on a shorter section of the Seine river.