Curtain Call at the Tampico

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

Quick walkthrough

 * 1) Look for Dean in the Tampico Theater.
 * 2) Search for the backstage key.
 * 3) Find a way to disable the Tampico's hologram security.
 * 4) Play Dean's holotape at the Tampico's Holotape Projector
 * 5) Head to the Tampico's backstage and speak with Dean.
 * 6) Kill Dean Domino or don't.
 * 7) Escape the Tampico before Dean's collar sets off your own or just leave using his key that he gave you.