The Sierra Madre entertainer pass is a paper note in the Fallout: New Vegas add-on Dead Money.
Location[]
It is added to the Courier's Pip-Boy, along with the entertainer pass, after dealing with Dean Domino on the backstage stairs of the Tampico, at the end of Curtain Call at the Tampico.
Transcript[]
This appears to be a unique 'Entertainer Pass' for the Sierra Madre.