مَنْ حَضَرَ؟
Who attended?
Here man asks for the identity of a person, so the question is genuinely information-seeking. Compare أَلَيْسَ اللَّهُ بِأَحْكَمِ الْحَاكِمِينَ؟
Is Allah not the most just of judges?
The latter seeks acknowledgment of a known truth rather than unknown information. Its rhetorical function is taqrīr (eliciting assent). Interrogative form alone does not determine rhetorical purpose.