The meaning of this presence is not physical presence, since those Honorable characters Like Hazrat Zahra (SA) and Saheb Al Zaman (AS), their existence surrounds all human beings and they are also sensitive to the behavior of the Shiites, so they naturally have a very special attention about the gatherings of Imam Hussein (AS) mourning ceremonies. Therefore the purpose of this presence is their spiritual presence in such mourning gatherings for Imam Hussein (AS).
source : erfan.ir