Hello Ana Luisa,
There's a cool jazz night on wednesday 9th. Here, just in the middle of Paris. It's a first set music-second set jam session concert with Luigi Grasso. A truly amazing jazz saxophonist accompanied by excellent musicians. It will be down in an old cave, typically old parisian stuff, very jazz ambient.
I think there's no cover (I've never payed before though). If you want, I'll be attending (I'm a jazz musician), you can call me and we can get there together. Otherwise the address is here:
22 Rue Jacob
Write a personal message if you need to know more!