I'm surprised that you haven't heard back from from two of the three user group leaders that you contacted. We tend to be a diligent bunch when it comes responding to requests for information. I'd be willing to bet that you'll hear back from them soon...
Once you're on a user group's mailing list, you'll be notified when a meeting is coming up. Some groups meet monthly, others every other month, others, like mine, meet on a quarterly basis.
The man with all the answers is Richard Doyle. Now that he's been tagged, I'm sure he'll improve upon what I've said.