To make it happen, sell a set number of tickets at a high price. For example, offer only 200 tickets at $100 a piece. That generates $20,000 of revenue AND 200 people registered in your online giving platform BEFORE your event even starts!
When the Golden Ticket is drawn, the winner picks any auction item they wish. You can still give the donor(s) of your items credit and promotion, but mark it as sold in or during your program.