How many guests did he indicate would be staying?
With all we’ve learned, it’s looking more and more like there were to be accomplices but they failed to show up.
So, is each address important?
a) nothing genius about this one: it gave an address as a general meeting place - ppl could sign onto his account from somewhere to see what had address been reserved (would that cause an ‘airlock’?).
b) more creative: it was a place to exchange vehicles full of ??
c) mathematician: Code. A series of numbers.
Marry the numbers of the event hotels with the houses and/or their listing id numbers and see what you come up with. Is there a pattern?