Expression: "...come to help celebrate..."

[Tom]

Hi

I would request you to shed some light on the bold red part of the following sentence. Is it OK? If so, could you please explain to me the nature of the sentence and give a few examples exactly of the same structure? As far as my humble opinion is concerned, I find something missing between ghosts and come, e.g, that had or who had.

1- The large ballroom was crowded with familiar ghosts come to help celebrate her birthday.

Tom

[Tom]

Tom

[Torsten]

Tom, you are right, the sentence should read

... with ghosts who had come to help celebrate...
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[Mister Micawber]

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Yes, a nonfinite (past participial) clause modifying ghosts:

...crowded with familiar ghosts come to help celebrate her birthday.

... and this is my brother, just returned from Iraq. (note that this one is nonrestrictive)

... Please put it on the table covered with the green cloth.
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[Tom]

A lot of thanks to everybody!

Just one more question!

[Mister Micawber]

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Yes, the comma is OK there, too. Without the comma, it defines the ghosts; with the comma, it is added information about them.
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