Try the Atlantis Rangers of Greenbelt MD. It may be a little far to go for meetings, but they have a website and dive all over the East Coast. They have been around for at least 27 years - I dove with them in 1976 and had a wonderful time
http://www.fred.net/tbrady/rangers/
Here is another list from the Lake Rawlings web site:
Mid-Atlantic Scuba Diving Clubs
Aquatic Explorers
Alexandria Virginia
Atlantis Rangers
Greenbelt, MD
(703) 590-1786
http://www.fred.net/tbrady/rangers
Bottoms Up Divers
Hopewell, VA
Charlotte Scuba Club
Charlotte, NC
Charm City Underwater Explorers
Baltimore, MD
Chester Dive Club
Chester, VA
http://www.chesterdiveclub.com
Deep Sixers Dive Club
Fort Meade, MD
Delaware Underwater Swim Club
Wilmington, DE
(302) 234-3060
Jacksons Mill Divers
Jacksons Mill, WV
(304) 884-7332
fnfarm@msn.com
James Madison University Scuba Club
Harrisonburg, VA
http://www.jmu.edu/orgs/scuba
Lamda Divers
Washington, DC
Nubian Divers of Charlotte
Charlotte, NC
(704) 623-2720
http://www.nubiandivers.com
Patowmack Divers Dive Club
Alexandria, VA
(703) 243-4855 x-110
info@dediver.com
Peninsula River Rats
Hampton, VA
(757) 864-3974
Richmond Dive Club
Rum Runner Dive Club
Winterville, NC
(252) 439-4390
rumrun@greenvillenc.com
The Hammerheads
Grafton, VA
(757) 898-4774
cwdiving@commonwealthdiving.net
The Hammerheads
Virginia Beach, VA
(757) 481-7949
ldctrv@idscuba.com
Triangle Dive Club
Research Triangle Park, NC
Tricount Diving & Rescue Club
Bel Air, MD
info@tricount.org
Underwater Adventure Seekers
Washington, DC
Undersea Explorers Club
Richmond, VA
Underwater Explorers Club
Hampton University
Hampton, VA
(757) 727-5725
VA Tech Scuba Club
Blacksburg, VA
(540) 961-2902
West Virginia Divers Association
Princeton, WV
(304) 425-8144