Local rap artist Skrilla was there live-streaming with YouTuber N3on near Kensington Avenue and F Street.
Police responded just before 7:30 p.m.
Officials said the rapper was there to shoot a music video, however, police said they did not have a permit.
Ground video from the Citizen App shows patrol vehicles surrounding the gathering.
The meetup was posted ahead of time on social media, which had more than 23,000 views.