J.F.
Hi J.!
Unfortunately, my baby is probably way too young for a playdate with yours, but I had a thought that might help. If you've never been to the Mall of Georgia kids' play area, it's fantastic. I went with a mom's group one Saturday (even though our babies are still crawling). There are tons of little ones playing. Even if you couldn't set up a formal group, your son would still get the socialization and you would probably wind up meeting moms there. Just an idea.
P.S. It's on the lower level in front of Nordstrom.