Our registration has an opt-out of sharing their information with the sponsors. The vast majority are not opting out (around only 4% have opt-ed out). We said in this that if they opt-out they cannot receive any prizes at our keynotes. This seems to work, as people love free stuff.
We are asking all our sponsors to give at least one prize that will be given away during keynotes (majority in the featured keynote). These prizes can be anything you want. Discount or free use of your product. Something electrical. Fun toy. Whatever you want. Can be one prize or two (two max).
We will say who is giving the prize away when we pick the winner.
We will have the person winning go to your booth to pick it up.