My wife often laments that no-one ever wants to come over to hang out and do nothing together. That’s all she and her friends used to do. The merits of an invitation today have to be judged against all the other things people have on their plates. Hanging out and doing nothing rarely clears the bar. 

A good friend of mine is *so* good at this. They frequently pitch days when we can cowork together or "stitch and bitch" (mostly chatting, minimal complaining, but the rhyme is fun). Coworking usually means bodydoubling to get life administrative tasks done, and stitch and bitch is for chatting, with optional handicrafts, mending, cooking, whatever. It's great. They're really good at building friendship and community, and this is one of the many ways they do it. 

I had a friend who built a wooden Grand Canyon Dory, and the amount of sanding involved in building it was unreal. He was very good at having friends over to just watch and chat while he sanded the boat. He didn’t want any building help, just wanted someone to hang out and shoot the shit while he was sanding. We’ve moved to separate states for work, and more than going running or climbing with him, I miss the unstructured time of just drinking a few beers and chatting about life while he sanded the gunwhales.