Radio, Radio, Radio.
Please remember to bring or by two way radios before the event. This helps in safety and keeps you in the loop of road conditions. Also knowing where Johnny Law is helps.
http://www.amazon.com/Motorola-MR350...+two+way+radio
Amazon has them at a good price with the link above.
Lastly remember to sign up on the Google doc as route and other drive details will be posted there.