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How to say idiomatically “all the celebrities in the world” in French in this context?

Hmm, it seems from your question that you are attempting to translate from French to French… anyway, you are right to state:

Toutes les célébrités dans le monde passent…

is unidiomatic.

What works is:

Toutes les célébrités du monde passent…

Toutes les célébrités mondiales passent…

but:

Tout ce que le monde compte de célébrités passe…

is better as it places a stronger emphasis on the subject.