Message them to understand what happened and agree on a new date and time.Reschedule the class and select “student asked to cancel/reschedule” as the reason.The situation is truly hypothetical and unreal, because it is now too late for the condition or its result to exist.Past perfect conditional or past perfect continuous conditional if this thing had happened, that …'happend' is a spelling mistake of happened.Happened is past tense ie- the storm had happened a week before the playoffs.Regards, vitor rabbit