def _replace_uid(event):
    """
    Replace an event's UID with E41JRQX2DB4P1AQZI86BAT7NHPBHPRIIHQKA.
    """
    event.pop('uid')
    event.add('uid', 'E41JRQX2DB4P1AQZI86BAT7NHPBHPRIIHQKA')
    return event