https://www.eastbaytimes.com/2020/11/09/those-wild-firework-drones-after-joe-bidens-victory-speech-explained/

Joe Biden addressed the nation for the first time as president-elect on Saturday. But it was what followed that had the crowd and even himself surprised.

A light show in Wilmington, Delaware, illuminated the night sky spelling out “Biden,” “46” and “USA.”‘ It even included a map of the United States.