A fan got in contact with the organizers and this was their reply:
Indeed, there is only one Festival at dépendances de Persivien : the (awesome) festival des Vieilles Charrues 😉 .JMJ will play the 15th of July. Nothing is planned on July 13. Thank you!
Jarregirl YouTube
Concerts attended:
Théâtre Marigny, Paris - 2007
Symphony Hall, Birmingham - 2008
RAH, London - 2008
Wembley Arena, London - 2009
NIA, Birmingham - 2009
POP Bercy, Paris - 2010
NIA, Birmingham - 2010
O2 Arena, London - 2010
Zénith Aréna, Lille - 2010
Port Hercule, Monaco - 2011
TUI Arena, Hannover - 2011
Festival International de Carthage - 2013
Barclaycard Arena, Birmingham - 2016