I just wanted to say good luck with this. I would suggest maybe creating a facebook group for the jam so people can communicate to each other about it.
Also, in your example these is a link to the rubric doc, but it links to Speedy Share. This site requires you download their installer in order to get the doc. Not sure many people would do that, I know I won't.
I had plans to create a Jam for C2 as well, so I am very excited to see how this works out :)