Welcome to the boards! I think this is a great idea, and I would love to attend. In fact, I am already planning a meetup for January which may very well be in Sac. Of course, that doesn't mean you can't have one anyhow.
However, there may be two good reasons to wait until January. First, people are just too damn busy and stressed this month. Let people recover from the holidays and their New Year's Eve parties. Second, we should be getting a Nordyke decision from the 9th Circuit very soon. My plan was to make the gathering an 'Incorporation Celebration' and hopefully make it a very large event. Incorporation of the Heller decision also adds a considerable layer of legal protection for us, just in case there's any harrassment by the local LE.
In any case, if you do go forward with an event in December, I will try to make it. For me, it would have to be on Saturday for me to attend.