This is the annual gathering of id Software fans and, as of recently, of Bethesda/Zenimax fans as well. In 2013, it was the third time I attended. It was pretty much fun. It took place in the Hilton Anatole hotel near Dallas Downtown.
The 2013 edition was also to be the last time that John Carmack would have his famous opening keynote of the event. A few months after that, he left id Software for good.
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