There are no "leaders of the movement". There are a few Twitter/YouTube personalities that are popular and have been rallied around, but they don't control anything.
Most of the GG organizing takes place on anonymous imageboards and IRC, and most of it is through consensus along the lines of: "Hey, we should do X!" "That sounds like a good idea!"
..could organize a fund-raiser to provide a forum for Anita Sarkeesian to present her talk.
Counterproductive at best, considering that GG takes issue with Sarkeesian's presentation of the facts. Now, if she would agree to a moderated debate about same, that would be just about perfect. I would personally contribute resources to making that happen.