Not bad! Was this developed from scratch, or did you start with a template? My only recommendation is to make closing the pop-up boxes consistent. In the MANIFESTE section, you click outside the pop-up box in order to close it. However, in the ARTISTES section, you have to click on the pop-up box in order to click it.
From my experience as a developer, it's more intuitive to close a pop-up by clicking outside of its wrapper. You may also consider adding an "X" icon, in the top right corner of the pop-up boxes. Make clicking on that icon close the pop-up. "X" icons are universally understood, and I think adding it could improve your overall user experience.
Don't be afraid to add multiple ways to close out of a pop-up box, as long as they're intuitive!
Not bad for your first project!