Ideally if the Barbies wanted to do a meet up IRL I would think their best option (in regards to being fair to everyone) would be on a airplane, or blimp that makes a stop at each of their locations, and then cruises. Personally I don't think meet ups are a good thing, but a cruise ship, or cruise blimp might be something more fair than even whatever inis was planning on.
I definitely wouldn't advise meet ups though.