I will visit on a regular visa. And I am not looking for a teacher nor a job.

The thing is that I need to do something when I'm there and for the foundation to be sure that I got something going on they want me to establish contact before my trip.

That may be hmm.. maybe I will visit the Toyota factory and will get a guided tour by someone in particular. Then they want me to have spoken to him/her before. And that they give me like and "sure come over"/"invitation" It can be by email exchanges or by letter.

The criterias are rather loose in general, but they just want to be sure that you are going to do what you say you are going to do. If everything is in order they just choose the most interesting projects.