Perhaps eitally refers to the Iditarod Trail Invitational?
> The Iditarod Trail Invitational is the world's longest winter ultra marathon by mountain bike, foot and ski and follows the historic Iditarod Trail from Knik, Alaska over the Alaska Range to McGrath and to Nome in late February every year one week before the Iditarod Sled Dog Race. The short race 350 miles finishes in the interior village of McGrath on the Kuskokwim River and the 1000 mile race finishes in Nome. Racers have to finish the 350 mile race in a previous year before they can enter the 1000 mile race.
> The Iditarod Trail Invitational is the world's longest winter ultra marathon by mountain bike, foot and ski and follows the historic Iditarod Trail from Knik, Alaska over the Alaska Range to McGrath and to Nome in late February every year one week before the Iditarod Sled Dog Race. The short race 350 miles finishes in the interior village of McGrath on the Kuskokwim River and the 1000 mile race finishes in Nome. Racers have to finish the 350 mile race in a previous year before they can enter the 1000 mile race.