I don't believe you're allowed to refuse a home visit from your PO without one heck of a good reason, like you're in the hospital or dead. Anything else, you'd just have to change your plans to accommodate the visit.

1. You know your hearing is coming up, it up to you to secure counsel prior to the hearing. You can certainly try to get a continuance but depending on how much time is between the notice of hearing and the actual hearing, the court may not grant it.
2. Getting discharged at a hearing for a violation is highly unlikely to happen.
3. You cannot apply to have something expunged until you have completed your sentence, i.e. parole. Even then, in MN since you were convicted only the court record is sealed. Background checks would still be able to find it. None of this matters anyway because sex offenses can never be expunged.