Set one up. I haven't seen any "scheduled" garage days since this one old-people club in PA. Every other forum that has a garage/tech day just has whoever needs something posting about it.
Once my heap can be moved out of the garage, I would be happy to provide shelter and tools, but I'm way out in the middle of nowhere so you'd really need to have something done in a garage to make it worth it.
It'd probably help if you put where you live under your little avatar thing too, just FYI.