Lookup an event by name.

        :param str item: Event name
        :return Event: Event instance under key

def get_event(self, name, default=_sentinel):
        """
        Lookup an event by name.

        :param str item: Event name
        :return Event: Event instance under key
        """
        if name not in self.events:
            if self.create_events_on_access:
                self.add_event(name)
            elif default is not _sentinel:
                return default
        return self.events[name]