Advertise WEEKS in advance. We hold ours in the Church parking lot, and we are visible from the main road. The idea is church members, neighbors, or anybody who would like to participate arrives early and decorates the trunk of their car in a festive, non-scary theme. Some we had last year were Pooh Sticks Bridge, Victorian Tea Party (in a minivan), Hawaiian pig roast (had a toy pig in the trunk roasting over red fake coals) one person had a pickup truck they did as Noah’s Ark. We placed cans at each contestant and voted for the best one with money. We then gave 1st 2nd & 3rd place ribbons. We had candy to give out at each trunk. We also had lots of games and prizes and sold hot dogs & Coke. If it is too cold out, you can do this in a gym or fellowship hall with foot lockers instead. We received an awesome response from the community & neighbors which in turn gave the youth great visibility.