It's not just Paris but it's everywhere now there's a curfew before midnight. The other problem is about starting earlier is crowd timing especially black people timing is very bad, for example at Fally's U Arena you won't believe how long it took people to make their way to the venue especially the seated ones which forced Fally to not go out until enough people were indoors. Because especially Congolese artists they won't start the show until they know almost everyone is inside because if they decide to just start performing whilst people are still making their way in they will know rival groups will mock them and start spreading rumours that they eventually started selling tickets for cheap at the door or were giving away free tickets etc.