Randonneuring, the definition:
http://www.machka.net/rand.htm
(complete with links to events etc.)

Just to confirm ... Randonneuring is NOT touring. Randonneuring is NOT a charity ride. Randonneuring is NOT just any long ride. Randonneuring is also NOT racing because everyone who finishes within the time limit "wins".

It is a sport sanctioned by a couple of groups out of France (ACP and BRM) and is basically long distance riding on a specific course, for specific distances, over a specific length of time for each distance. You can read more about it on the website I posted above.


As for doing brevets and randonnees on a fixed gear ... I have not done that, but a good friend of mine has. He's done everything from little 100 km populaires to the full 1400 km LEL. You might want to especially check out the Audax UK link ... the English tend to do their audax events (brevets and randonnees) on unusual pieces of equipment such as fixed gear bicycles.