While it's too late to signup to compete, you should seriously think about showing on to root on the field of 120 skiers, boarders and telemarkers. You'll be participating in making history. Thunderbolt is a challenging trail developed by the Civilian Conservation Corps. There are no chair lifts, the racers must "earn their turns" by hiking/skinning to the top. Without lifts or grooming, it is considered a "backcountry" trail. They don't make trails like this any more.
This is no two-bit race. It is highly organized, well funded and will be receiving substantial media attention. The Mass DCR and large contingent of National Ski Patrol will be on hand, along with warming huts and first aid stations. The trail is maintained religiously by the Thunderbolt Ski Runners Club of Adams, Mass.
If you can't make the race, and want to try your hand at skiing/boarding it, it's on DCR/ Mass. State Park land, so anyone can try it, providing you are willing to hike.
There is no charge for spectator admission.
For more info, check out the race and club site: