I just want to point out that these conferences can be Huge. In Orlando I worked as a booth babysitter at an Orthopedic Surgeons convention. 20K plus attendees. They have continuing Education requirements to meet... The trade floor was open 3 days for 4 hours a day. Booth I watched at night was the size of a basketball court minus end zone and sidelines. They rented that booth spot for 235K and a booth construction guy said they spent 1M on the booth total. That's for 12 hours of open over 3 days... Was all the nuts, bolts, screws, rods, and plates they put in humans. Horrendous.

While many of these flights may indeed be assassinations, symposiums, conferences and such aren't that unusual, and at a large convention not that odd for a group in the same field to fly together.