At least 14 people were hospitalised after falling ill during a Chainsmokers concert at Discovery Meadow in San Jose, California, on Friday 4 September. The San Jose Fire Department responded to reports of multiple patients needing medical attention shortly after 8pm, prompting a large-scale emergency response. The incident raises concerns about crowd safety and substance use at large outdoor music events.

The fire department said it deployed an Ambulance Task Force, two additional advanced life support units and a Battalion Chief, with 14 ambulances ultimately transporting 14 patients to local hospitals. Police told local media that some attendees were being treated for suspected alcohol intoxication and drug-related issues, though the exact condition of those hospitalised was not disclosed. The Chainsmokers continued their performance despite the medical emergencies and later shared footage from the show on social media, but have not otherwise commented on the incident.