During the first five Jams I created and curated a zip file full of files that stood me good stead over the first few Raspberry Jams. It was really easy to transfer straight onto the Pi's. Mostly contains Minecraft coding tasks with some Sonic Pi written by Ben Davies.
If you are thinking about running a Jam but do not know where to start this should help you out :) here is the link. It also contains hackpack volumes 1-4. Link https://drive.google.com/a/nicholaschamberlaine.co.uk/file/d/0B2ICknEY6ZXtM2k4WEdBUXJzQjg/view?usp=docslist_api
I hope its useful :)