This is not an official Denver Atheists meetup but I imagine a lot of people would be interested in attending this (if you had not already heard about it!). No need to indicate if you can't make it, but it should be a great talk (in addition to Richard Dawkins, Elisabeth Cornwell and Sean Faircloth will also be speaking at the Macky that night).
Tickets are $12 for adults and $6 for students. Tickets are available at the following link and I'd suggest getting them soon if you are getting them! Any questions, please use the discussion on this event and I'll get answers as I can.