Override attendees field in Event with vocabulary and use 'Event View'

1

I have added a new 'Event Attendees' behavior, which works OK.
I will use this for several content types.
It would be nice if I could use the default Event View. Is there a way to show the 'fullname' instead of the useid (which it does now)?

Current code:

@provider(IFormFieldProvider)
class IMeetingAttendees(IEventAttendees):
    """MEETING Attendees Schema."""
    attendees = schema.List(
        # or Tuple
        title= "Attendees",
        description= "List of attendees.",
        required=False,
        value_type=schema.Choice(
            title="Attendee",
            required=False,
            vocabulary= 'My.Addon.FullnamesVocabulary'
            
        )
    )
    directives.widget("attendees",  AjaxSelectFieldWidget, vocabulary= 'My.Addon.FullnamesVocabulary',  klass="event_attendees")

def FullnamesVocabulary(context):
    members = api.user.get_users()
    # Maybe this is faster/better?
    #  portal_membership = getToolByName(portal, 'portal_membership')
    # # Get a list of member objects
    # members = portal_membership.listMembers()

    if members:
        # Create a list of SimpleTerms for each full name
        terms = [SimpleTerm(value=member.getId(), token=member.getId(), title=member.getProperty('fullname')) for member in members]

        return SimpleVocabulary(terms)
    
    return SimpleVocabulary([])

directlyProvides(FullnamesVocabulary, IVocabularyFactory)