Curtain Call at the Tampico

 is a quest in the Fallout: New Vegas add-on Dead Money.

Quick walkthrough
Where is the Holotape Projector?

- The Holotape Projector is up a staircase, overlooking the stage. If you are facing the stage, the staircase is to the right of the stage.

Where is the key to up stairs? The key is in Vera's Partitures. After Dean stops talking turn right, the first door you see is where you need to go. Its the one in the corner.

Where is the last holoprojector for the Hologram guard that patrols the stage? There is one right in the entrance hallway to the backstage, another one hidden behind a couch in the storage room backstage, but where is the third and final projector? After activating the projector the holograms disappear.

Do you have to kill Dean once you talk with him backstage? No you don't have to

Behind the scenes
Curtain Call at the Tampico is actually a reference to the 1956 hit, "Smash that Tampico" by Sim Pinkett