Mash’ar al-Haraam which is also called “Muzdalifah” and “Joma’” is a famous place between Mena and Arafat (its boundaries are the mount Ma'zmein and Hiyadh and Wadi Mohassar) and it is obligatory for those who to go to that place after Wuquf in Arafat and it is precaution not to delay going to that place if it is possible.
Wuquf in Mash'ar al-Haraam is obligatory from the dawn until sunrise and it is also an obligatory precaution to stay the night there and pray to Allah and it is obligatory to have the intention of closeness to Allah for all of these acts.
Leaving Mash'ar without any religious lawful excuse and going to Mena because of ignorance has no problem, but if a person performs this act deliberately, then he/she should pay one sheep as the atonement, but his/her Hajj is correct.
Wuquf in Mash'ar al-Haram is a pillar of Hajj and if a person renounces that deliberately, then his/her Hajj is invalidated.
Although staying all the time between the dawn and the sunset in Mash'ar al-Haraam is obligatory (and even staying the night of Eid is also obligatory as a precaution), but staying the night solely is enough for the correctness of Hajj, but as we said before if this act has been performed deliberately, it is a sin and has the atonement of one sheep.
It is allowed for the below listed to stay a while in Mash'ar and then go to Mena.
2- Ill persons
3- Old men
4- All persons who have an acceptable excuse
Therefore, all people who have an excuse can stay a part of the night in Mash'ar and then depart for Mena; so old men, ill persons, children and all those who have to accompany them for nursing or guidance and those who are afraid of congestion of the crowd in the morning of the Eid can go to Mena in the night (after staying a while in Mash'ar al-Haraam and pray to Allah) and perform Ramy al-Jamarat al-Aqaba; but it is Mustahab precaution not to leave Mash'ar before midnight, and it is precaution that guides return to Mash'ar after taking people who are in their charge if it is possible.