Just wanted to post info on a few upcoming conventions happening in my area.
GuadaComaCon 2012, August 18, 2012 - This is a one-day convention in beautiful New Braunfels, Texas. Fellow blogger DesertScribe is the host for this mini-con. Events include a spaceship miniatures game hosted by DesertScribe (see a previous game by the Scribe), a homegrown fantasy minis game run by Hill Cantons, and Ed from Two Hour Wargames will run a ground based sci-fi minis called 5150: Star Army.
FoWSA 2012, September 15th, 2012 - A Flames of War tournament here in San Antonio. Hosted by Biff Coon. This is the seventh year for FoWSA and it has always had great attendance! Bring a 1500pt Mid or Late War army. First two rounds are shortened to just 750pts so a flexible army will do best.
MillenniumCon 2012, November 9-11, 2012- The Premier Miniature Wargame convention in Texas, held each year in Austin. Hosted by Lone Star Historical Miniatures. The events are varied across genre and game styles. Has a great dealer room and a swap meet on Sunday morning. Far too many events to list here, so check the website for all the latest info.
ChimeraCon 2013, April 5-7, 2013 - An all-around sci-fi/fantasy/gaming convention in San Antonio. I ran a GURPS:Prime Directive game in 2010 and had a great time! Missed the 2012 con because they changed the date to Easter weekend, but I'll consider going again in 2013.
There are definitely more conventions in Texas and nearby. I choose to highlight these because I personally know the event organizers. These are all great events so please take a look at the websites. Thanks!