Email Lists
randon mailing list - visit groups.google.com and join randon, a mailing list devoted to worldwide randonneur cycling
ultracycling mailing list - visit topica.com and join ultracycling, a mailing list devoted to ultramarathon cycling

Other RUSA Clubs in or near the Mid-Atlantic Region
Eastern Pennsylvania Randonneurs offers a complete ACP series
New Jersey Randonneurs offers a complete ACP series
North Carolina Bicycle Club Randonneurs this High Point NC club offers a complete ACP series
Ohio Randonneurs offers a full ACP series and 1000km out of Columbus Ohio.

Organizations
Randonneurs USA - membership organization for US randonneuring
Randonneurs Mondiaux - international sanctioning body for 1200km and longer events
Audax Club Parisien - French authority for all brevets and Paris-Brest-Paris
League of American Bicyclists  - national bicycling advocacy organization
Ultra-Marathon Cycling Association - promotes long-distance bicycling with a more competitive focus

Longer Randonneur Events
Paris-Brest-Paris (PBP) - August, 2007
Colorado Last Chance 1200km - September, 2006
Bonifay-Cheaha Challenge 1200km - Northwest Florida, October, 2006