There are basically two parts to your question. 1. Combined Ziki is permissible or not ? 2. Is joint prayer permissible ? 1. Is it permissible to have a combined Ziki ? The answer is , most jurists say , combined jikir can be done. However, subject to certain conditions - one: the voice can not be so high that it hurts himself and others. Two: Must be free from worldliness. (Emdadul Ahkam B: 1 , p: 320) Three: Raising the voice of Zikir cannot be considered as Ibadat. (Fayzul Kalam 139) Document: Abu Huraira. He said : The Messenger of Allaah (peace and blessings of Allaah be upon him) said: Allaah says: I am in the state of obedience and I am with him. The Messenger of Allah, may Allah bless him and grant him peace, said , "Allah Ta'ala Himself has instructed me to treat my servant as he treats me, and when the servant reminds me, I become his companion." If he jokes alone I remember him alone. If he shouts in congregation , I remember him in a better congregation. If the servant moves one step towards me , then I move one hand towards him. And if he moves one hand towards me , I move two hands towards him. If he walks towards me I run towards him. (Sahih Bukhari 6/526 Sahih Muslim 4/208) Imam Suyuti Rah. He said that the remembrance of Allah in the assembly is usually not a little louder. (Sibahatul Fikir 45) It is proved by the mentioned hadith that it is permissible to recite dhikr collectively, subject to conditions , especially for the purpose of teaching others. 2. Is joint prayer permissible ? This too is considered permissible by most of the jurists. Document: Hazrat Salman Ra. From the narration of the Prophet (peace and blessings of Allaah be upon him) said: The Prophet (peace and blessings of Allaah be upon him) said : When some people raise their hands and pray to Allaah, then Allaah will surely grant them what they ask for. (Majmooz Jawaid 10/179) It is understood from this hadith that when some people pray in the court of Allah, it is more likely to be accepted. Sadly , there are two kinds of polarization in our society regarding combined prayers and jikir. Someone thinks it's absolutely urgent. And some call it illegitimate and bidat. But both ideas are wrong. The fact is , it is only permissible ; Not necessary , not even bidat. So exaggeration is absolutely inappropriate. However, it is better to do any prayer and jiki in a low voice. It is to be noted that I have not received the fatwa of Darul Uloom Mueenul Islam Hathazari , but as a Talib Ilam of Darul Uloom I am saying that , as I have said , I hope that the fatwa of Darul Uloom will not be an exception - InshaAllah.