About 1.5 million say they're going, and another 1.1 million are interested, but how many, if any, will actually show up remains to be seen.
Area 51 was officially acknowledged as an Air Force base in 2013, but has spurred conspiracy theories as an unidentified flying object and alien holding site for decades.
The promise of force from multiple military and civilian agencies is in response to a Facebook invite created by games streamer SmyleeKun, which describes meeting up at the Area 51 Alien Center in Amargosa Valley, Nevada.
It's unknown how numerous 1.5 million Facebook attendees would actually travel to the remote location in Nevada for the event, as the page has sparked Internet memes poking fun at the idea of storming the Air Force range for the opportunity to see aliens.
The group, called "Storm Area 51, They Can't Stop All of Us", has over 1 million users registered to meet on September 20 "at the Area 51 Alien Center tourist attraction and coordinate our entry", according to the description on the group's page.
According to the Facebook page, there are now 1.5 million people who have said they will attend the event.
And there are the Naruto Runners, who can outrun bullets as long as they keep their heads down and their arms stuck straight out behind them.
"Area 51 is a classified research base", Lazar said.
The US Air Force is not taking the possibility for granted.
"The United States Air Force is aware of the Facebook post", Air Force spokesperson Laura McAndrews told ABC News in a statement.
CNN has reached out to the Air Force and is waiting to hear back.
The Air Force says it does not discuss its security measures and that the test and training range provides "flexible, realistic and multidimensional battlespace" for testing and "advanced training in support of USA national interests".