I want to talk about a very simple idea: resources. We all have excess and deficit. So we should trade. I'm good with technology but terrible at dancing (and I need to learn before August). I probably have the wire you need for that gadget you bought, in my drawer (and I don't need it), but I do not own an immersion blender that would make thanksgiving lunch 10x easier (we're really good cooks).
So we should trade. I already know of several people who live in my neighborhood - over time, you will too. As a progressive, I believe in sharing unused resources. I really don't need to have that extra copy of How to Cook Everything (extra-extra, if you count the app) on the shelf every day of my life, nor do I have much use for my knowledge of wireless router setup.
Sharing unused resources requires a mechanism. DK4 is that mechanism. We have private and group messaging, so no identifying information needs to be shown in public. Diaries like this allow for general discussion - we can easily offer help with general questions in comments. Comments and photo diaries full of recipes and local tours have worked well for years.
I don't know what the Trades part looks like. A cooking lesson is worth more than a usb cord, but I don't know who is supposed to make note of that and to what end. If you get intricate enough, you're talking about a Time Bank, which I'm not really talking about (but I don't exclude that idea, since I'm not really excluding anything from this discussion).
We'll do these formational discussions in diary comments so that discussions of the group's scope can be entirely open to outside comment. Hopefully we'll get commentary from anyone passing by, not just "committed members". Maybe if someone is just wandering through, they'll feel free to tell me why, specifically, the idea is stupid, helping to find the group's reasonable limits.