Denton used to have one, but doesn't anymore. We do have the Tuesday Night Ride though. Which, in the warmer months, had been getting upwards of a hundred kids on fixed/ss, 10speeds, mtbs, cruisers, bmx, and tall bikes. It's not a CM ride, but we jam up traffic and, to me, it has similar goal (meet up and ride).
There IS a CM in Fort Worth though. I know a lot of the people involved in it, but I'm not sure when it is. I haven't ever had the chance to do it. I can find out easily, and when I do I'll post back here.