A small club can run a Jambo, just pick an area you already know well and if possible are local to. Our canteen was run by the show ground committee, nothing to do with SJC, this meant it was run well (these guys new what they were doing) and it got the community involved and committed to the event. When we needed machinery for the onsite track they helpled us out as they were committed to a successful Jambo as much as we were.
If it helps we can pass on all our budget and expenses details to the next club as well as a write up on what worked and what didn't. We want to make sure there is another Jambo, worst case scenario we'd run it again just to keep it alive
As an aside the Friday saw over 200 Jeeps signed up for trips, this is where a lot of your resources will go and your trip leaders need to really know the tracks.
Cheers
Steve