Yeah bro, I also remember the raves in the early 00s because I was always a part of it 😁, either in Britain or in the East of France next to Strasbourg, some really cool raves in the woods, or in the country side. Around Paris it's always abandonned industrial building, where you had to call a hotline that would reveal the location last minute.
Though the Gendarmes (police) always closed in, and brought dogs, helicopters, trucks, to announce that the party was over.