The other club I belong to (not the one I lead for) is doing a flat century in the cranberry bogs of SE MA on 10/1. DH and I are thinking of doing it. I've done one century, also flat, in 2006, with no real training. I just need to do a few 50-75mile rides and I'll be fine, since all of the rides I do around here are hilly and require time in the saddle.