We have several different types of garden clubs and societies. Rock Garden, Primula, Peonies, Alaska Native Plants to name a few. And then there are the general ones like Anchorage Garden Association (mostly master gardeners).
I belong to the rock garden group and volunteer to help keep up the rock garden beds at the botanical garden. Works well as I am a volunteer at the gardens anyway working with the facilities manager on their plant inventory database. I have donated quite a few peonies to add to their collection including about 15 American Gold Medal winners they didn't have. I believe they have almost all of them now except for a couple of tree peonies. We are doing some testing on two tree peonies to see if they will survive there. They are at least a zone colder than I am and I have successfully grown then to bloom.
The native plant people have winter meetings and presentations (I am doing on on the only endangered species in Alaska (a fern found only on one island in the Aleutian Chain), then munchies of course. No tea though it would be nice.
What is your 'van'? It sounds like an automobile but you describe it as almost a cabin.