Moly, if it's the TBEC event, don't be fooled by the name. A great set-up, offering enjoyable riding, but it's a hare n hound type event where the majority of the riders will be on enduro tackle. (unless it's changed since I last raced with them, 5 or so years ago)
Big trail bikes will most certainly be a rarity, if not non existent. I may be wrong, but best to check with them first
Mark