During this period, no security perimeters will be set up (no zones will be enforced), but certain streets will be closed to traffic.
Here are the places in Paris that will be affected in April:
Concorde zone
March – June 1st: Progressive extension of the worksite to the entire Place de la Concorde
Trocadéro – Eiffel – Champ-de-Mars zone
March-July: Progressive extension of the worksite to the entire Champ-de-Mars and Trocadéro gardens, the southern part of the Place du Trocadéro, as well as the Avenue des Nations Unis and the Pont d’Iéna
Grand Palais – Pont Alexandre III – Invalides zone
Mid-April: Installation begins on the south-east lawns of Place des Invalides
Mid-April – Mid-June: Gradual extension of the worksite to all the Invalides lawns and the Avenue du Maréchal Gallieni; closure of the Cours la Reine between the Alexandre III and Invalides bridges from April 26, and occupation of the Alexandre III bridge and nearby low-level quays from May 17
You can consult the official map to find all the assembly phases of these temporary sites.