At the IAEE Expo! Expo! tradeshow last week (December 9-11, 2014), we spoke with tradeshow organizers that struggle with the question of whether or not to allow their exhibitors to send emails to their attendees using the show’s registration list. Some have had terrible things happen with their attendee list, including one organizer, from a big show, that found out that one of their exhibitors was reselling the list. This is not uncommon. Offering access to the registration list helps selected exhibitors drive booth traffic, increases exhibitor ROI and thus retention rates. However, how do…