Final answer:
The provided reference does not match the details of the question about Henri, John, and the Halloween parade, as it appears to be from Henrik Ibsen's play, A Doll's House, where no mention of a Halloween parade or the characters Henri and John occurs.
Step-by-step explanation:
The question asks about characters from a text attending a Halloween parade, but the reference provided seems to relate to the play A Doll's House by Henrik Ibsen, where characters named Nora and Helmer discuss a fancy-dress ball. The dialogue between Nora and Helmer indicates they are talking about a future event and Nora's costume for the ball. However, the names Henri and John do not correspond to characters from Ibsen's play, and there is no mention of a Halloween parade in the provided text. Therefore, it is not possible to accurately respond to the question without additional context or a correct reference. To best assist the student, more information regarding the source material of Henri, John, and the Halloween parade is required. Without the correct reference, one cannot confidently identify who goes with Henri and John to the Halloween parade.