def p_event(parser):
    """
    event   : event_core SPACE event_arguments
            | event_core SPACE
            | event_core
    """
    parser[0] = parser[1]
    try:
        parser[0] += parser[2]
    except IndexError:
        pass
    try:
        parser[0] += parser[3]
    except IndexError:
        pass
    return parser
