Hi, Richard. Our group is very informal and there is never a meeting agenda - just non-theists getting together to chat over food and drink. The meetup page is here. You need to sign up on meetup.com to join, but that's free. http://atheists.meetup.com/209/
BTW, if you just want to check us out without signing up on meetup, we meet at The Globe coffee shop on the 3rd Tuesday of each month. Hope you can join us sometime.