[_yb2s]

It's pretty fascinating stuff, and totally doable. I stand corrected on the "any athletic event"- what I said doesn't apply to ultra long duration lower intensity events. Endurance will be higher but peak power outputs lower. For endurance focused events like the ones you described, I could see it being an advantage- everyone will run out of glycogen, but those already keto-adapted won't need to suddenly start trying to adapt during the event.