He sets up training courses, then he makes a contract with the trainer and the owner of the venue
Question

                I organise educational and training courses for working people. I suggest courses and receive from the companies a list of attendees and payment in full, then I make an agreement with the trainer -- who does not work with me -- and I pay him his fees and the costs of the training venue from the payment I have received. What is the ruling on that?.
Praise be to Allah.
    There is nothing wrong with supervising educational and 
    training courses in the manner that you have described, and receiving 
    payment in advance. This is a kind of hiring which the scholars call “hiring 
    for a specific task”, the aim of which is work that has been agreed upon 
    between one who is hired and the one who hired him, without any stipulation 
    that the work should be done by a specific person. The scholars are 
    unanimously agreed that it is permissible to pay the entire fee in advance; 
    in fact, some of them -- such as the Shaafa’is -- say that this is 
    obligatory and regard it as a condition of it being permissible. 

    And Allaah knows best. 

    See: al-Mawsoo’ah al-Fiqhiyyah, 32/286-287 

    And Allaah knows best.