G.S.
There are MANY groups in NC to get involved with so that your boys will have so much to do (fun and educational and social). Contact NCHE www.nche.com and you should be able to track down the Mecklenburg County group. There are some fees associated if I recall and sometimes they request parents to get involved or organize and activity once a year. There is an annual book fair at Calvary Baptist Church on Rea Road too.
(I grew up homeschooling in Charlotte)
http://nche.com/region/r04/index.html This is a link to the groups specifically in Region 4 (includes Mecklenburg County and surrounding areas)