Here's one I have been thinking of for a while.

Kind of a Overhaulin' type of thing.
Buy or have a un restored car donated. Have a shop paint it before the show, hopefully with donated sheet metal parts and material. Have the car arrive on Wednesday and brought to one of your buildings. Then throughout the weekend have the various suppliers come in and install their products on the car. Motor, trans, interior, you get the idea. By Sunday it is done and given away either as your giveaway car or sell raffle tickets to recoup costs to the vendors or for charity.

Mark at Blue Star Performance