Jamie
The open race starts at 10am and is a mass start normally about 90 riders, top 30 riders go in front first, rest of us battle it out for first bend or obstacle, courses are normally about 3.5 miles long and your do about 3 laps or less if you give up early. They like to add in some technical bits, normally bomb holes, steep inclines, logs etc, most are ok. Let all the Lycra clad speed whippets go of first then pick em off one by as the laps go by, normally ride over or into the roadies that are clipped in and fallen off by obstacles
Seriously though its a great atmosphere and racing experience, don't be daunted by the race name, its more for fun. the serous racers go off at 2pm after we have churned the track up for them before in the morning, I'll be there on Sunday if your going and feel the need to race....