There are a few different trans related conferences around the country at different times of the year, but I don't know how easy it is to meet people at these events. I think it is easier to get to know folks online and identify opportunities to meet up with them in person if that kind of socialization matters to you. Especially PTHC, I know a lot of guys who are going and 100% of them have already made plans before the trip to meet up and spend time with people. I think it would be difficult to insert yourself into someone else's schedule at those events for more than a few minutes unless you arranged to do so ahead of time.
On Facebook, there is an FTM Mentors group. It's mostly geared towards online socialization but I am sure I've seen people looking for local or within-a-reasonable-traveling-distance mentors and friends. The last time I checked there were not a lot of completely post-transition guys there, but perhaps they're there and didn't comment. But that might be of use to you. I'm not sure if it's closed or secret. If you can't find it and would like to, send me a message and we'll figure out how to add you to it.
One thing I just want to say as a caveat (not specifically to you Dean, but to anyone reading this who is looking for something similar), because it's so rarely mentioned but I've always found it to be fairly obvious - relationships between people who are not done with their transitions and people who are done transitioning are really one sided. It's why there are just a fraction of guys who have had lower surgery who are willing to participate in open forum spaces. It's why many guys remove themselves from spaces about T, spaces about top surgery, spaces that talk about document updates and coming out, etc. when they're done with their transitions. It's why we have exclusive post-transition spaces. It's exhausting being asked for information and not getting anything back. So if relationships with post-transition guys is something you want to cultivate, treat them like they're actually your friends. Ask the things you want to ask, but also ask them how they're doing and what's going on in their lives. If that seems like too much work, then it's better that you just post questions online and get your info that way.
That said, I'm happy to accept friend requests and chat with people online who are looking for more end-of-transition info.