Great thread and great question:
I serve guest once about every two weeks and I would serve more if I had a more regular schedule.
Family "get together": I introduce everybody to a French Press of something fantastic, never mediocre or average in any way. Not just an Ethiopian Yirg, but a Ethiopian Ididio Misty Valley or a Biloya. Also, usually speaking, with my family I don't do much more than make the press pot and have the cups already on the table at the place settings. If they want it, they can ask for some when I start pouring mine. It is a family thing, I don't want anybody to feel pressured. Believe it or not, my parents don't like the taste of specialty coffee such as Biloya or anything like that. That call it "strong" and such. They are crazy and don't know how to describe it, so they call it "strong." I will fire up the espresso machine for espresso and capps for my wife and myself; Again, I never offer, and wait for somebody to ask me for one. They always do.
Friends: Here I am more aggressive. I have had three dinners at my home with friends and no family, last August. My wife made a nice three course meal and we used the China, including the saucers and cups. I made
several French Press pots and there was Biloya, Kenya, Brazil and Guat represented. Everybody went nuts and loved it.
Frequent Coffee Guest: I have one person in my church that doesn't live that far from me and she will come over and the wife and I will make several shots of espresso and several capps for all of us. Usually she will come over after I have made a order, about once every two weeks. I always get her a bag of something and she is there partly to pick up her bag and partly to take advantage of a two group Faema in a friend's house! LOL I have take out cups and all. In fact, the bag of Guatemala Finca I just got for her will be delivered to her office in town with a take out capp!

Figured I would bring one of those McDonald's four cup trays and put three extra capps in there for her co-workers.
I would actually like to have more of the "Frequent Coffee Guest," not just this lady but others as well. I just enjoy doing the work of a barista and seeing people excited about what I am doing. And hearing comments like "This kills Starbucks coffee" makes me feel like a champ!
Anyhow, what do you mean by invasive? People hang out at coffee shops all the time and those espresso machines and grinders are pumping out drinks while people chat and talk.
I think invasive because, especially with where I am from in rural Eastern North Carolina, espresso is a very, very new thing. In fact, even progressive high schoolers and college folks still don't really "like" espresso because they only have been exposed to $B espresso (dark roasted, bitter, crap). So, when you just pull a shot for somebody and sit it in front of them A) they feel like they HAVE to drink it. B) They feel like they HAVE to say something nice. The lady that I spoke about that comes to my house to drink espresso? It took her three visits before she would say, "Now that is a good shot!" She was very wary of raw espresso. I think you just have to respect people's "personal space" for taste and expectations. You need to figure out how to introduce them to espresso on an individual basis. With her, Nikki (my wife) had to actually make some comments on what she could expect to experience and taste verses her preconceived notions in her head.