Another cool function for sched.Event: as_subtype() returns this item, as its
underlying (conference) type.
Implemented as a property for that ruby-like no parens option.

Sample usage:
>>> sched.Event.objects.all()
[<Event: The Rhinestone Revue>, <Event: Late Friday>, <Event: The Main Event>, <Event: The Original Newcomer's Showcase>, <Event: Betty Test Volunteer Shift>, <Event: What the Hell is Isadora Duncan Dance?>, <Event: Cancan>, <Event: What the Hell is Isadora Duncan Dance?>, <Event: Stage Kitten>, <Event: Follow Spot>, <Event: Sit Rover>, <Event: Test shift>]
>>> [event.as_subtype for event in _]
[<Show: The Rhinestone Revue>, <Show: Late Friday>, <Show: The Main Event>, <Show: The Original Newcomer's Showcase>, <GenericEvent: Betty Test Volunteer Shift>, <Class: What the Hell is Isadora Duncan Dance?>, <Class: Cancan>, <Class: What the Hell is Isadora Duncan Dance?>, <GenericEvent: Stage Kitten>, <GenericEvent: Follow Spot>, <GenericEvent: Sit Rover>, <GenericEvent: Test shift>]