You got to think out of the box so to speak. You could have it be "loot" for combat classes. Crafted, surveyed and/or sampled by crafting classes. For example: craft "X" items and you have a chance that a "clue" disk will be given. Same with surveying and sampling. Same could be done for Entertainers/ID.
Seeing as I don't have a combat toon past novice marksman, I didn't even know about the event till about 3 days ago. But from what I heard it was done quite well.