I think it was discussed upthread somewhere, but as we've seen on the other two DOs it's simply impossible to do this with more than 5 people. It's not an issue of the types of techniques discussed, it's simple practicalities. I think the people who've attended the others would agree.
As far as the list, I'm really not sure how to go about it
... Maybe something like people who've never attended have priority? But then how would someone learn more advanced topics?...
Any and all suggestions are welcome
One thing though - I would love to do it fairly often now that winter is finally going away. That way many more people would be able to come.