[Gardener]

In addition to the advice above, I would probably do a brain dump of every task I could think of for the festival ("Investigate poster printers" "Ask Joe about the artist he used for Widget Festival poster", etc., etc., etc.). You can then tuck the tasks into the structure that you've created using Christian's advice, and if any don't fit, then you have a head start on figuring out what you need to add to the structure.

Gardener