When we load an event which is an `instanceOfEventPHID`, we can also load the original event and attach it. The we can do something like:
`public function getIsCancelled() {`
`if ($this->getInstanceOfEventPHID() && $this->getOriginalEvent()->getIsCancelled()) { return true; }`
`return $this->isCancelled;`
`}`
so as not to lose the cancellation state of an event when the parent recurrence is cancelled/reinstated.