I would copy what Adafruit do, make a G+ circle and add people to it when they ask on your G+ stream. Then send the invites out. Google should handle the rest for us. I can make myself free any time this weekend even if you want to just try out the G+ circle thing to see what it is like. I'm at home watching F1 or studying my OU degree this weekend so should get a ping on my phone.
Once you have tried it you should have an idea at the level of work is needed to keep something like this going. I'll be a regular mostly because I'm a big show off. :) LoL
