Elvis has left the building

used to inform an audience that the famous person, often a performer like Elvis Presley, has finished their show and left the premises

The idiom "Elvis has left the building" originated in the world of entertainment, particularly in the context of Elvis Presley's concerts during the 1970s. It was used by the emcee or announcer at the end of Elvis Presley's performances to inform the audience that the concert was truly over and that Elvis had departed the venue, discouraging fans from waiting for an encore or hoping for his return. Over time, the phrase has evolved to convey the message that an event or situation has come to a definite conclusion, often with a sense of finality or closure.

After the graduation ceremony ended, the principal announced, "Elvis has left the building," signaling the official conclusion of the event.
When the CEO finished addressing the company's annual meeting, he humorously stated, "Elvis has left the building," to signify that there would be no further speeches.
As the final credits rolled at the end of the movie, the director playfully added, "Elvis has left the building," as a nod to the iconic phrase.
After the last note of the music festival was played, the organizer declared, "Elvis has left the building," and the crowd began to disperse.
In a press conference, the team's coach declared, "Elvis has left the building," indicating that the star player had been traded to another team, and the chapter was closed.