def METHOD_NAME(old_event, new_event, **kwargs):
    if old_event.type_ == EventType.conference:
        return
    # for meetings/lecture we want to keep the default timetable style in all cases
    theme = layout_settings.get(old_event, 'timetable_theme')
    if theme is not None:
        layout_settings.set(new_event, 'timetable_theme', theme)