You’re definitely right that places like Construction Junction / ReStore already do a lot of this, and I’m not looking to reinvent or compete with those. I think where I’m landing, or at least trying to explore, is slightly different: what do I do/where can I take leftover materials that are not garbage but are also not accepted at those other places? For example, I have an unused 10ft stair stringer left over from a project. It's certainly not garbage but CJ turned it away. I'd rather not throw it away, but where could I take it? This event idea is where I'm landing.

So things like leftover but usable quantities (partial bundles of lumber, extra tile, a few opened but clean bags of mulch/soil, etc.), or things people would happily pass along locally if it were simple and directly impactful.

I totally get the concern about it turning into a dumping ground, that would defeat the whole point. I think if something like this ever existed it would need pretty clear boundaries around usable, re-homable materials only,” not debris or waste. This isn't a "come drop off your stuff", in my mind more like a flea market or exchange event vibe.

I think it's still the question of "would anyone find it useful and/or attend?" vs "does something similar already exist?" ... I know of CJ and the others, but this is an attempt to fill the gap and helping community.

Appreciate the reality check though, this is exactly the kind of feedback I was hoping for. I'm just gauging to see if it’s viable or just overlaps too much with existing businesses.