User blog comment:Cooksey.michael/Community Connect: A Smashing Success/@comment-26468976-20151010031813/@comment-4522253-20151011213020

There were a lot of factors in invitation, I understand (how active the community is, how active the admins are, etc.) International representation was also a factor; while everyone spoke English, it was not the native language (nor was America the home nation) of about half the attendees. Being an admin was a pre-requisite (and likely the community had to have a WAM score within the last year), but being an admin for a certain time period was not. We had attendees that had been admins for anywhere from months to a decade.

FWIW, the size of the community was less of a factor. Five Nights at Freddy's has only 100-150 pages. American Horror Story has 350-400 article pages. Downton Abbey has 600-700. Riordan has 1500 or so. On the flip side, Disney Wiki has 33000+ pages and was not represented.