The Constructing Modern Knowledge Summer Institute focuses on participants actually working on developing a project. Might this be a venue to work on planning an educational game? While it does look like a good event, I took a look through the faculty and speakers who will be present in 2012, and I didn't see anyone with game design experience other than possibly Sylvia Martinez (http://genyes.org/about/bios#sylvia), who has experience as a manager of educational and video game software design.
The focus of the conference/workshop appears to be using technology to encourage student-centered, constructivist learning. I expect constructivism would be a component in any good educational game so you might consider checking out the Summer Institute information.
Free symposium about gaming in education August 1 to 2, 2012 in Troy, NJ. Focus appears to be on using video games but a look at last year's schedule shows session on the general idea of using gaming in the classroom.
Includes references to multiple studies regarding the effectiveness of games for teaching. (The reference citations are not complete but there is proabably enough here to find the sources.) The post also promotes a book by the author on this subject.
This post also includes a link to (what I believe) is a peer reviewed article disputing the usefullness of games in education.