Nothing yet. I put the ideas in my back pocket. I have medical stuff happening in February, so the earliest I could do anything would be April/ May time frame. Summer is not a great time because many people are traveling. So if I don't get my act together to do something informal, than I can use it for the birthday party which is fall.
I did sign him up for the event again and asked 2 boys if they wanted to join. If they do, then they can invite the rest of the boys that they are closer to. It's a public event that has a small fee. If they don't want to join there is always middle school boys at this event so he will always have a friend to play with. This is the least amount of effort on my part and with my upcoming medical stuff, my aim is to go easiest route while also contributing something.
More of an interesting observation than anything. He was in Cub Scouts since 1st grade, and it was split into 2 Dens. I am just now realizing (Covid affected it too) that one of the Dens gelled socially, and the parents facilitated get togethers. The other den which of course by chance, DS ended up in, never not once invited DS to a birthday party, playdate or anything else beyond official Cub Scout Business. The lunch table is all this other Den (that he wasn't in) plus DS and 2-3 boys that were never in Cub Scouts.