Word from Grifter is CycleOverride to return to DEF CON 25.
The description from last year:
"Bike ride around Las Vegas in the desert heat."
Their twitter account I think is: https://twitter.com/Cycle_OverRide and may get added to the forum description.
Their website I think is: http://cycleoverride.org/ and may get added to the forum description
I am not affiliated with this event. When the organized post something, please ignore what I have posted and direct your questions at them.
Thanks!
-Cot