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

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.