Just some observations and advice...
1. You may want to start a new thread for a new meet date since digging through this one is confusing. New dates should have a thread dedicated to that date.
2. It's hard enough to get everyone to go, and many have last minute cancellations. Try to plan it around an interesting event so that at least if everyone backs out, those that show up have something else to do (besides WDW). That makes a secondary incentive to showing up, assuming nothing urgent pops up. I've had people back out of events they paid for, so usually money is not a motivator. A special event at Disney tends to motivate, and if you want to get really special, see #4 below.
3. Short of looking like a gang, everyone should display their alien green mickey so you can get spotted as a disboard member. That way if everyone looks like a giant group of weirdos, one can keep their ears in their pocket and keep walking






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4. Maybe someone can get Disney to host an event for this.
Ford used to host an owner's meet for another forum I was on, if they were able to confirm I think at least 20 people to attend. It included a tour of the factory / assembly line, lunch, sneak peeks at development, etc... and people would travel across the country for that. Then there were separate activities to turn it into a 2-3 day thing.
If Disney hosted a special tour of some kind, I don't think you could hold the members back... plus it's fun because you got a special event out of it. Numbers have an advantage... It may cost Disney $1000 to host 30 people... but it almost guarantees 30 FL-AP renewals or purchases at about $10,000, and I know people question their renewals. If they got a special annual event for FL-AP holders out of it... I think it tips the scales.
... and all they have to say is theme park admission required.