I’ve created a super official Google+ community, please feel free to join it, it’s open to everyone. This weekends meeting will be scheduled through there because of it’s hangout integration. Having everyone within the community should make it easier to get everyone in the hangout on time (which will be announced on Thursday).
It’s not just for organising hangouts though, feel free to post what you want there. It seems to work quite well for large communities sharing all sorts of media. Have fun.