So people don't have to Google-fu to find the St. Louis Grand Championship stuff, it's held at Warfaire Weekend, Nov. 8-10. From my understanding, this was previously a Warmachine-only convention for 10 years or so, prior to expanding out to more games this year. The housing block is now open. Registration/ticketing is not available yet, but coming very soon. I'll bump this thread when that begins.
Also, to keep informed on your own, there is a Warefaire Weekend Facebook page.
Also of note, this is kind of a great area to have a convention. It's in the midst of a heavy bar/restaurant which you can reach in minutes of walking, sometimes seconds. You can get there and never have to get in a car all weekend.