Praise be to Allah.
The question is somewhat vague, but if what is meant is that they read it together in unison, pausing and stopping at the same places, then this is not prescribed by Islam and at the very least is makrooh (disliked) because it is not reported that the Prophet (peace and blessings of Allaah be upon him) or his Sahaabah (may Allaah be pleased with them) did such a thing. If, however, it is done for the purpose of learning, then there should be nothing wrong with it. If what is meant is that they gather to read Qur’an in order to learn it and memorize it, and one of them reads whilst the others listen, or each one reads to himself quietly, and not in unison with the others, then this is allowed because it is proven that the Messenger of Allaah (peace and blessings of Allaah be upon him) said: “No people gather together in one of the houses of Allaah and read the Book of Allaah, studying it together, but tranquillity descends upon them, the angels surround them and mercy covers them, and Allaah mentions them to those who are with Him.” (Reported by Muslim).
Comment