This AfterRenderJavaScript = "afterRender(data, isCallBack)" does not exist in DayPilotCalendarConfig for MVC.
How can I make a workaround to get it? (Though you claim it is there in your kb articles. http://doc.daypilot.org/calendar/afterrender/ http://doc.daypilot.org/calendar/callback-update/ )
It's now available in the latest sandbox build (7.5.5595):
http://mvc.daypilot.org/sandbox/
It will be included in the next release.