Someone has to have the idea of attending the Jamboree and the project usually springs from there. The skill in getting the project off the ground is in how you promote the idea.
Focus on the parents
You need to have the parents ‘on side’ and supporting you either before you sell the idea to the Scouts or at the same time. If the parents are not supporting the project and recognizing its worth, any effort trying to convince the Scouts to go is generally wasted.
It will be the parents who chase reluctant Scouts out of bed and off to Fund Raisers. And it’s the parents who cajole and encourage the Scouts to attend the Jamboree when they have bouts of ‘cold feet’ when the going gets tough.
What the Scouts get out of Jamboree is covered in What’s In it For Me?
Communication is key.
The Time To Plan document has more details.