I'm putting together a mountain bike tandem and am trying to find a couple of events this summer. All of the races I know of are full or already occurred. I was wondering if someone out there might know about some events. The ones I know of are: Sea Otter XC, Lumberjack 100, Leadville 100, Laramie Enduro, and Chequamegon. I do see that the Leadville Siver Rush 50 is open and has a tandem class. We may go up and preride sections to see what they are like before entering. Any others?