When conference organizers count people, the number they care about most is registered paying attendees; they track that every day as the conference approaches. Suppose you are an outsider, considering attending or sponsoring or exhibiting at the conference, and you inquire as to the likely attendance. You will never be given the real number; instead you will be told a number which is at least twice that, and usually higher. This is justified by including trade-show exhibitors’ staff, the conference organizer’s own people, PR folk and journalists, the food service crew, and is basically pulled out of a monkey’s butt. Just thought you’d like to know.