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Put another way, they got a better offer

That’s the weird part. I doubt they’re using the space so this strikes me as “think of the money we’ll save on hours” bean counting

Companies/Vendors usually host corporate conferences around this time as well.

A large company has probably decided to move a conference to Caesar's during that period, and that got Defcon bumped. Especially because DefCon has become massive, so the RoI has shrunk due to staffing overhead.

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