Preregistration is required for premium content, BYOD and BYODex sessions and special events. Seats not filled five minutes before the schedules start time will be released to those waiting in the stand-by line on a first-come basis. For special events that required an additional fee, sold seats that are not filled will be released 15 minutes after the start time. To ensure availability of BYOD and BYODex sessions, preregistration is limited to one BYOD or BYODex sessions per day. Attendees may join the stand-by lines for opportunities to participate in additional BYOD and BYODex sessions.