There's a Family Enduro the day before, and if you've never tried one they are a blast. For $20 bucks you can ride on largely the same terrain as the full-on enduro, and see how good you are at maintaining a 12mph average (for the morning) before picking it up to 18mph in the afternoon.
The FES series has everybody from buddys-on-the-gas-tank to grandpas who used to have national numbers keeping time with nothing more than an odometer and a wristwatch.
Good fun, a real friendly crew - just a real good time.