https://www.snopes.com/fact-check/area-51-raid-images/
"About 100 extraterrestrial enthusiasts converged at the back gate of Area 51 near Rachel to follow through on the original Storm Area 51 plan…
…Law enforcement officers blocked the road about a mile from the gate, with attendees walking the rest of the way. About a dozen officers were stationed at the gate, ready to act if anyone tried to breach the area. At the strike of 3 a.m. an officer with a police dog in tow, walked up from inside of the gates.
Some of the crowd acted as if they were going to “storm” the gates, but stopped after getting laughs from the crowd, as Europe’s “Final Countdown” blared from a attendee’s speaker.
Law enforcement officials were lighthearted for the most part about the gathering, joking with the crowd. They gave a stern warning to a man in a purple Lucha Libre mask for touching the gate as he posed for pictures."