Participation in an undeclared rave party in the countryside of Roybon, Isère, tripled between Friday and Sunday to reach some 1,500 people. The festive gathering had begun in the night from Friday to Saturday around 2:00 am "on private land, an agricultural field sown" The prefect announced that he had activated a crisis cell on site including firefighters, gendarmes and rescuers until the end of the rave party, which according to the prefecture "could last until Monday"