I'm just curious about some of the earliest extreme races - did most just fade away or are they still happening on a very grassroots level? I organised the first ever race on Canyon Creek in Washington many moons ago. This was in direct response to a dam threat on the creek. The dam never happened and to the best of my knowledge the race still does. Might be a cool idea to trace back the origins of extreme races to see where we were and how far we've come.