From what I hear, your MOC and occasionally your BGO should contact you about your appointment right before you receive an email regarding a status change and portal status change. Then a week or two later, you should get the BFE. But everyone is different. I've done some reading around on the forum and this is how most people say they were notified. Just to be clear, the BGO doesn't offer the appointment, he notifies you; the only one who can make an appointment offer is the admissions board itself.