I am one of two GMs for our fairly large group, and love the system Fantasy Flight has put together. We go back and forth with it (between other systems) as we swap out GMs.
With the movie coming out, and my birthday right around then, I decided that I would try and have a 'round robin' style marathon (like we used to have when we were kids).
In the case of this gaming marathon, each of the players would have to volunteer to run something (I have almost all the printed and downloadable modules available), and we would rotate GM duties through the group.
We would start early New Year's Eve (because many of us have the day off), and play though until late New Year's Day (or as long as some of us 'old fogeys' can make it).
Right now, most of my players have run few to no games, and are planning on running premade modules. I would have the 'greenhorn' GMs run something like the basic boxes near the beginning of the marathon, and some of the more experienced GMs running longer adventures/sessions/modules as the night wears on. This way, the greenhorns would be handling characters with lower XP pools, and the more experienced GMs will be handling the larger, beefier characters.
I am planning on having characters made early (or having folks select premades from the large amount currently available), and having these characters play through the marathon. By the end of the game, they would be pretty far along the XP path.
I am also planning on setting up a schedule for folks, so they know when they are running, and I plan on stringing the modules/adventures together so they feel less disjointed.
What are your thoughts? If you were to do something like this, how would you go about it?