UltraMarathon Cycling Association has lots of useful articles listed on their site:
Audax is a cycling sport in which participants attempt to cycle long distances within a pre-defined time limit. Audax is a non-competitive sport: success in an event is measured by its completion. Audax has its origins in Italian endurance sports of the late nineteenth century, and the rules were formalised in France in the early twentieth…
A simple, cheap routesheet holder
BRMs are conducted under the auspices of the Audax Club Parisien
The PBP USA Wiki was created as a place to share information relevant to US riders going to PBP, wikipedia-style. No doubt much of the information may be useful for residents of other countries. Access the PBP USA Wiki here.
The official list of finishers: http://www.aukweb.net/results/archive/2017/listevent/?Ride=17-1