Doubtful. Especially since now the guys at 51 know to prepare for it. Probably, if nothing else than to prevent dumping gasoline on the Area 51 conspiracy theory fire, they'll just have the base on lockdown/be ready to detain anyone not overtly violent.Over 120,000 people are preparing to get wasted.
Then they'll probably engage in "interrogations" that will be the world's most tongue-in-cheek thing in the world in which the interrogators have to drop threats of sending them to Gitmo and leaving the room with a "think long and hard about your future" but really they just need to go out in the hall so they don't burst out laughing in front of the prisoners. Then they'll likely mass-release with a "don't come back naw, ya hear" or minor federal charges.
Honestly who the hell believes, whatever the actual history, that the government still uses Groom Lake for anything. It's probably only even still staffed to keep the UFO crowd distracted while they do whatever high-tech experiments at other black sites that don't have the same mystique.