Lollapalooza 2026 began on Friday with a sold-out event featuring a mix of rock and pop music. The lineup included both debut performances in Brazil, such as Doechii, and the highly anticipated return of bands like the Deftones, emphasizing the festival's eclectic nature. The event drew in a massive audience of 100,000 fans, demonstrating the festival's popularity and the draw of its unique combination of musical genres.

Headliner Sabrina Carpenter managed to captivate the largest crowd, marking her fifth appearance at the festival and this time in the main slot. The contrast between the two musical styles at the festival was evident, with a more serious rock environment featuring artists like Viagra Boys, Interpol, and the Deftones, alongside a vibrant pop and R&B atmosphere led by Carpenter, Doechii, and Blood Orange. This dichotomy was reflected in the visuals of the crowd, with attendees breaking into groups based on their musical preference, showcasing a mix of both monochrome and colorful attire.

Despite inclement weather leading to muddy conditions, festival-goers were well-prepared, sporting cowboy boots which became a key fashion element among attendees. The festival's first day highlighted not only the diversity of musical talent on display but also the enthusiastic spirit of the fans, setting a lively tone for the subsequent days of the event.