Videos of the concert, which surfaced on social media, showed thousands of people standing shoulder-to-shoulder, many without masks, dancing at the outdoor venue.
Additionally, over 2,150 people attended the concert, which was well above the number of allowed attendees.
The state will seek $20,000 in fines for holding a nonessential gathering and failure to enforce the wearing of face coverings at the event, according to a statement. The conditions at the concert risked spread of the coronavirus, Cuomo's office said.
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According to the state, the promoter was issued the permit after the Special Events Application said safety measures would be in place to protect against COVID-19.
He also barred the town of Southampton from approving permits for group gatherings without state approval, Cuomo wrote on Twitter. However, the state says that, "critically, the promoter's Special Events Application omitted reference to a designated "friends and family" section where concertgoers could freely congregate and where mask-wearing was not enforced". "Frankly, I don't know what they were thinking".
Tickets for the event ranged from a couple hundred to a few thousand dollars for a vehicle spot to see The Chainsmokers perform with all proceeds going to charity.
After video of crowds at the show began to circulate over the summer, Cuomo called the event a "gross violation" of health rules and common sense. In addition, DOH said the event was not held in accordance with other safety measures outlined in the permit application and promotional materials, and created conditions that increased the risk of spreading COVID-19 in NY.