Changing someone’s mind about technology or any other concept is extremely hard. If your boss or client is not tech-savvy, it means you have to be really tactful with technology and in this case with event apps. You do not want to sound patronizing. The best way to start is to find the right time and prepare a detailed plan. It may be a longer process than you expect as you cannot be too pushy. Your role is to show an alternative to current solution and prove it may be beneficial for a given company.