get_object(self, request, *args, **kwargs)
                Can be overriden to allow for more complex events,
                see syndication documentation.
                Optional, defaults to None.

items           Returns the list of events.
                Must be set.
filename        Filename of the file returned in the view.
                Optional, defaults to 'events.ics'.
cal_name        Name of the calendar.
                Optional, defaults to None.
cal_desc        Description of the calendar. 
                Optional, defaults to None.

item_summary    The "title" of the item.
                Optional, defaults to unicode representation of item.

item_end        Duration or end time of item.
item_duration   Optional, defaults to None. Must not define both.

item_url        Optional, default calls item.get_absolute_url()
                Should return a URL with the fully-qualified domain and
                protocol (e.g. 'http://www.example.com/blog/') or an
                absolute path (e.g. '/events/'). If only a path is
                present, the 'django.contrib.sites' app will be used
                to insert the domain of the current site.
                Note: To find the current site, 'django.contrib.sites'
                      must be in your settings.INSTALLED_APPS (it is
                      there by default)

item_uid        All correspond to their vEvent equivalents.
item_start      All optional, all default to None.
item_description
item_comment
item_location
item_last_modified
item_created