Final answer:
No specific individual is mentioned as arriving in the courtroom during Atticus Finch's closing argument in 'To Kill a Mockingbird'.
Step-by-step explanation:
In To Kill a Mockingbird, as Atticus Finch is finishing his closing argument, no specific individual is mentioned as arriving in the courtroom. The scene is full of tension, focusing on Atticus's speech rather than the entrance of any new characters. It is important to closely read the text for accurate details, as misunderstanding can lead to incorrect interpretations of the events in Harper Lee's novel.