Each event (I prefer not to call these gatherings "Do's", sorry, and I'll remind everyone that the PIM was NOT a "Do") has it's own characteristic, which sets it apart from others.
This is good, since there will always be varying tastes among the participants as to what they actually want to accomplish while they're attending.
For example, the PIM in DFW was designed as a tour-based event, with unprecedented back-stage access we won't see now, with the nation's security needs post-9/11.
With the ORD event, more than one thread exists for all of the events planned for that time, which is very original.
The MSY event was primarily aimed at the single members of FT, for fun and friendship,
techgirl's primary preference.
With the explosion in their popularity, as more people attend them, have a wonderful time, and want to host their own events, the main obstacle I see is being able to schedule all of them without hindering any other events.
That's going to be the challenge for future event planners. Good luck to you!
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The perfect ladies' man is a perfect gentleman.