Sierra Madre Gala Event

The  was an event mentioned in the Fallout: New Vegas add-on Dead Money. The quest that goes along with the event is, Trigger the Gala Event.

Background
The Sierra Madre Gala Event was a gathering of high society at the Sierra Madre Casino. The event took place on the night of the Great War, October 23, 2077. It was said to be an event of lights in the sky, while music flooded the villa streets. It ended with a grand finale of fireworks and the gates to the Sierra Madre would be open giving everyone who came through its doors a chance to begin again. But the gala event was cut short when the atomic bombs fell. The Sierra Madre had hermetically sealed for over 200 years and the holograms massacred the guests, seeing them as intruders.

Appearances
The Sierra Madre Gala Event is mentioned in the Fallout: New Vegas add-on Dead Money.

Through dialogue with Dog, the Courier can discover that the Gala Event had happened once before.

This makes it possible that Dog had originally been a guest at the Sierra Madre and was turned super mutant in the after math of the war. Dog was also placed in the Cantina Madrid during the sorting where Elijah says that if you looked or sounded like someone of the Sierra Madre you were placed on your corresponding floor. This provides evidence that Dog was probably on Kitchen Staff at the Sierra Madre before he became a super mutant.