There is nothing wrong with asking the readers of the club to make du’aa’ for a Muslim who is going through difficulties
Question

                Sometimes in our club -- which is an Islamic women's club -- we announce that one of the sisters is going through some hardships or that she is sick and needs du’aa’s, and the sisters come in and make du’aa’ for her. Is this action an innovation? Is it regarded as communal du’aa’, as we have set aside a spot for this purpose, and for chatting and socializing.
Praise be to Allah.
    The communal dhikr which the scholars have warned against 
    takes two well-known forms:

    (i)Where all those present recite 
    a wird or dhikr in unison

    (ii)Where the leader of the circle 
    says something, and those present repeat after him.

    The kind of asking for du’aa’s that is mentioned in the 
    question does not come under this heading. When the Prophet (blessings and 
    peace of Allaah be upon him) had finished burying the deceased person, he 
    would stand over the grave and say: “Pray for forgiveness for your brother 
    and ask that he be made steadfast, for right now he is being questioned.” 
    Narrated by Abu Dawood (3221); classed as saheeh by al-Albaani in Saheeh 
    Abi Dawood. 

    And it was narrated that Abu Hurayrah (may Allaah be pleased 
    with him) said: The Messenger of Allaah (blessings and peace of Allaah be 
    upon him) announced the death of the Negus, the ruler of Abyssinia, to us on 
    the day that he died, and he said: “Ask for forgiveness for your brother.”  
    Narrated by al-Bukhaari (1263) and Muslim (951). 

    Based on that, there does not seem to be anything wrong with 
    what the sisters are doing in this club; rather it is something that is 
    prescribed in sharee’ah because it is pointing the way to goodness and 
    helping one who is in need. 

    The Prophet (blessings and peace of Allaah be upon him) 
    encouraged making du’aa’ for a Muslim in his absence. He said: There is no 
    Muslim who prays for his brother in his absence, but the angel says: And you 
    will have something similar.”

    Narrated by Muslim (2732). 

    And Allaah knows best.