My personal opinion of conferences and festivals are that the presenters will give you a few tips on screenwriting. However, the screenwriters have to be able to discern the difference between fluff and reality. In my humble opinion, a lot of the presenters attend these events simply to promote their business.
The presenters know that most of the aspiring writers are hungry for success and unrealistic about their writing ability. These are the screenwriters who don't want to believe that their scripts are not going to win an Oscar or make the producer "Rich."