Too bad this site doesn't have a feature to help people find local playmates. There should be a search keyed to location information from profiles, with of course the ability not to display one's location and/or indicate whether one is up for play dates. The location would probably be best split into multiple fields, too. This should be something a website developer can throw together in a very short time.
A meet-up thread might do in the meantime. We are up for meeting anyone in the Hudson, NH area, including roughly Boston northward.