Similar to XC, Cyclocross (CX) sees riders completing laps of a mixed terrain/obstacle course. There is a time limit usually between 40 minutes to an hour, and the person to complete the most laps in that time is the winner! Obstacles can include trails, roads, paddocks, fences, trees, horse jumps, steps, whatever else the organiser can think of! And yes, you must take your bike with you through and over all of these things! Fancy dress is often donned, and kids races are commonly a part of the Nelson CX scene.
This is also a fantastic spectator sport because most of the course can be visible from the start/finish line, and there are always thrills and spills to entertain.