Just some info here on north side FLGS
I actually went to both Enigmas and Tri-Games this week. Enigmas is going strong again, and has several tables available for game play. I didn't see anything about the World Game Day posted in the store though.
Tri-Games is a bit small, but has about 4 tables, a back room, and as they stated on the Houston Gamers forums they can move the kids stuff out of the kids room if needed (kind of an original idea there, a room for the young kids that has toys, etc. while their parents shop and/or game).
The Houston Gamers are all about board games. I was invited to come out to the store Saturday to check into several games that I had just purchased (Runebound and Munchkin).