Last year I did this 3 day gravel ride from Truckee.
it's not a race, but it's 2 nights, (3 rides) and they haul your camping stuff to the camp and meals are fully catered. There's even showers/ hot water. The rides are not supported but they are awesome and there are places you can get water, etc. You can also rent a cabin if you want.
It's super fun and I thought I'd send it to this list (I used to live in Bend).
Ryan Ness