Mac De Marco in Lyon, in the old Roman theatre on the Fourvière hillside.
A picture here of the scenary
https://fr.wikipedia.org/wiki/Nuits_de_Fourvi%C3%A8re
It's been a joyous moment, that ended in a battle between band and audience. The weapons were cushions, thrown onstage and thrown back to the pit by all people onstage (De Marco and band members plus the opening acts who had enjoyed the show at a table lit by candlelight in a corner).
Music is not mentioned here, I liked it too. It really felt like holidays
when you were still a child.