There are several GIS User Groups that you might find of interest.
Here are the contacts for each group:

Northern NJ GIS User Group
Coordinator: Katy McSorley
Phone – 201-634-2806
Email – kmcsorley@co.bergen.nj.us

Central Jersey Regional GIS User Group
Coordinator: Jim Girvan
Phone – 908-231-7671
Email: Girvan@co.somerset.nj.us

Southern Regional GIS User Group
Chairperson: John Pavek, GISP
Phone: 732-919-8177
Email: jpavek@njng.com