Youtuber "GoToe" - known for his Kpop Random Play Dances hosted one at Washington Square Arch in NYC. Towards the end NCT 127 showed up and the crowd went crazy! They were rushed at first BUT everything was put back into order. They then joined in on the dancing!
Below is a few short clips I took. There are a ton on Instagram/Twitter and other social media but I don't want to post what isn't mine.