Your attorney doesn't necessarily have to file a response, although it might be a good idea. (Note that filing documents isn't how you 'prove' anything - pleadings are not evidence. You present evidence by introducing testimony and, sometimes, documents, at the hearing itself.) They certainly do have to appear for the court date, though, as should you.
If your attorney doesn't appear for the hearing, then you can ask the Court to reset (reschedule) it - they probably will do so on their own anyway; few judges would insist on carrying on a hearing without one of the lawyers present. The biggest problem would be if your attorney shows up for the hearing but is not prepared for it. You need to either get a new attorney, or lean on him to get ready - possibly by threatening to fire them at get someone new.
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