Sam Lippman had a simple way to tease the closing keynote speaker at the Exhibition & Convention Executives Forum (ECEF) at the JW Marriott Washington, D.C., on May 29: He brought him onstage just before attendees broke for lunch to offer a sneak peek at his presentation. "Included int he contract with every ECEF closing keynoter is a five-minute preview - before lunch - of their afternoon talk," said Lippman, who produces ECEF. "And this surprise teaser (it's not listed on the program) gives attendees a compelling reason to stay until the end of the program to hear the rest of the speaker's talk."