I try to work in bonsai wherever I'm traveling. Once, while tagging along at a conference for my wife, I'd asked elsewhere if there was any bonsai to be seen in that area. Someone messaged me and told me I was welcome to visit while in the area. I spent an afternoon in the backyard of a guy who's shown several trees at the US National show.
On bonsaiTalk, I asked if there was anything to do in another town and received a similar offer, ...except he trekked me around to 2 other guy's houses in the area as well.
I've been in one other (regular) bN-er's backyard as well, but the relationship exists outside of bN.
As for welcoming someone to my place, I wouldn't be opposed in a few months. (Hopefully within the year at least.). At present its not exactly presentable ...or at least not like I'd like it to be. As obnoxious as bonsai folks are online, in person they're absolutely the best.