This is what 2,000 people losing their minds to Jay-Z and Travis Scott looks like. Every Saturday, the cavernous space beneath Pont Alexandre III transforms into France's biggest hip-hop party: 300 lights, 85 square meters of LED screens, confetti cannons, and a sound system that shakes the Seine. The "OPERA" troupe drops live shows between DJ sets while the dancefloor swallows the crowd whole.