Holy hell, there's only a few people missing for it to literally be "all stars". Which makes it unfortunate that there are two tracks! How come IRDC never had this, and I haven't even heard it mentioned in rgrd?
The scope of this thing seems to have surprised everyone.
It appears to be a combination of location (many of the famous attendees live on the west coast I guess) and Noah simply emailing people to come.
As far as rgrd, I usually only step in there around events to ask if anyone is participating and have never gotten any interest from anyone. There were a lot of announcements on reddit.