def METHOD_NAME(self, moved_obj, source_location, move_type="move", **kwargs):
    """
    Called when an object arrives in the room. This can be used to
    sum up the situation, set tags etc.
    """
    if utils.inherits_from(moved_obj, "evennia.objects.objects.DefaultCharacter"):
        self.log(f"JOIN: {moved_obj} joined room")
        self.state.character_enters(moved_obj)