NYC tried out the Sunk Kata, and it went pretty well. It is not quite ready for public consumption (pieces of the power point notes are vague and uninformative) but you're already vaguely familiar with the material it does make for an easily focused meetup.

Another thing NYC does is "TED Talk Night," wherein we pick 5-10 TED talks. We watch each one, talk about it for a while, and then move on to the next one. This is good because A) TED talks are usually informative and entertaining, B) they prompt interesting discussions we wouldn't have otherwise had, C) having a line-up of them means that as soon as the conversation starts to flag, we can start the next one. And for online meetups, there's D) Google Hangouts come with a youtube channel that lets you all watch video at the same time.