Below are links that may be of interest to you. No endorsement of them is assumed.
New England MG T Register (NEMGT) Register: http://nemgtr.org/
Delaware Valley MG Car Club: http://www.dvcmg.com/
MG Car Club, Central Jersey Centre: http://mgccnj.org/
Eastern New York MGA Club: http://enymga.org
Keystone Region MG Club: http://www.keystonemg.com/