Ruling on registering with a group that will stay overnight outside of Mina
Question

                What is the ruling on staying with the groups that go for Hajj and their tents are in Muzdalifah, outside the boundaries of Mina? Are these tents an extension of Mina or not? Is there anything wrong with going with these groups? Does that affect the validity of one’s Hajj at all?.
Praise be to Allah.
    Firstly: 

    Staying overnight in Mina on the night before the eleventh 
    and twelfth of Dhu’l-Hijjah is obligatory according to the majority of 
    scholars, and the one who fails to do it without an excuse has to offer a 
    sacrifice of a sheep, to be slaughtered in Makkah and its meat distributed 
    to the poor of the city. 

    If a person cannot find any room in Mina, he should stay 
    where the tents end, even if it is in Muzdalifah, because Allaah says 
    (interpretation of the meaning): 

    “So keep your duty to Allaah and fear Him as much as you 
    can”

    [al-Taghaabun 64:16]

    “Allaah burdens not a person beyond his scope”

    [al-Baqarah 2:286]

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was 
    asked about a person who did Hajj and stayed outside of Mina: what does he 
    have to do? What are the guidelines about staying overnight in Mina? 

    He replied: If a person cannot find any room in Mina, he 
    should stay where the tents end. But if he can find room (in Mina) then he 
    must stay there overnight. 

    The guidelines about staying overnight are that he should be 
    in Mina for most of the night. But if he leaves Mina, for example to do 
    tawaaf al-ifaadah at the beginning of the night, then he is not able to go 
    back before dawn because of the crowds, there is no sin on him. 

    And he (may Allaah have mercy on him) said: It is obligatory 
    to look for a place in Mina before he decides to stay in Muzdalifah. If he 
    cannot find a place (in Mina) then he may go to Muzdalifah and stay there. 
    He does not have to go to Mina and spend most of the night driving around, 
    or looking for a spot on the roadside among the vehicles, because that may 
    put him in danger. We say: If you cannot find a place in Mina, then stay in 
    Muzdalifah, where the tents end, and you do not have to do anything so long 
    as you looked for a place but did not find any, because Allaah does not 
    burden any soul beyond its scope. End quote from Fataawa al-Shaykh Ibn 
    ‘Uthaymeen (23/240, 241). 

    Shaykh Ibn Baaz (may Allaah have mercy on him) said: If the 
    pilgrim tries hard to look for a place in Mina to spend the night there, but 
    he does not find any, there is no sin on him if he stays outside of it, and 
    he does not have to offer any fidyah, because of the general meaning of the 
    words of Allaah (interpretation of the meaning):  

    “So keep your duty to Allaah and fear Him as much as you 
    can”

    [al-Taghaabun 64:16]

    And the Prophet  (peace and blessings of Allaah be upon 
    him) said: “If I enjoin you to do a thing then do as much of it as you can.” 
     

    End quote from Fataawa al-Shaykh Ibn Baaz (16/149). 

    Based on that, he must register with a group that will spend 
    the night in Mina, or he may register with a group that will spend the night 
    in Muzdalifah, but he should have the intention of looking for a place in 
    Mina. If he finds a place he must stay there for half the night, but if he 
    does not find a place there is no sin on him if he stays in Muzdalifah. 

    And Allaah knows best.