Trump camp plans sit-down with outside groups after FEC relaxes coordination rules ( www.politico.com )
Typically, events such as these are organized by the Koch Family. They handle the nuts-and-bolts and technical end of things. Trump's campaign may have called this meeting, but I guarantee the Kochs will be providing the support.
Don't expect any leaks. They take extreme measures to prevent leaks:
1.) The guest list is kept a closely guarded secret, and has pictures to prevent impostors.
2.) The location where the conference will take place, usually a swanky, secluded resort, is also kept secret, and accepting an invite means you are also sworn to secrecy, as the location will not be told to you until you accept the invitation.
3.) The resort staff is screened and work assignments are changed to be far from the actual events and the rooms of the attendees.
4.) They routinely sweep for bugs and listening devices, and use white noise emitters to throw off parabolics.
5.) Any paper materials, either distributed by the event host or personal notes of the attendees, of the event are confiscated and destroyed.
They basically follow all the same rules that might be in place at a convention for people with TS/SCI clearance and the convention hall is a massive SCIF. But full of people plotting to undermine our democracy.