def METHOD_NAME(self, event_id):
    """
    Creates an event, if it doesn't already exist. Initializes the event title
    to a default value that can later be overridden.
    """
    if event_id not in self.events:
        venue, year = event_id.split("-")
        venue_name = self.venue_index.get_venue(venue)["name"]
        self.events[event_id] = {
            "venue": venue,
            "year": year,
            "title": f"{venue_name} ({year})",
            "links": [],
            "volumes": [],
        }