I've always thought that the
Ugley Nasty rides should be revived, although I believe that the originals were a circular route from Stevenage.
Starting in the next town north and, like some other events, using the ferries, how about the
Hitchin a Ryde?
Or, connect Christmas Common, beloved of south Chiltern events, with the hamlet of Cold Christmas, near Ware in Hertfordshire. The event could be the Christmas Wrapping or, less inspiringly, the Common Cold.