I'll be at the Houston show. I may drive to Dallas and Austin to see those shows too.
I saw Flotsam and Jetsam at Cardis when I was 15, but I came with my dad. Since I've turned 18 I've seen lots of shows there but they've never carded me. I honestly don't know what their policy is. However, I do know what a headache it is to reach the bastards on the phone. It is a bar, so try calling around 7 or 8. Any earlier no one will be there. Any later the music will most likely drown out the rings.