“Storm Area 51, They Can’t Stop All of Us” is an event created on Facebook that is currently planned for September 20, 2019, at Area 51, the US Air Force facility within the Nevada Test and Training Range (NTTR). The highly secure site has long been considered a crucial spot for UFOlogists, and the event purports to raid the site “in search of extraterrestrial life.”
Note: This is a great article on how a small rural county prepares for a possible mass event that started as a joke.