Go to the Tripoli Rocketry Association website and click on the "Clubs" link. Click on state of Texas and you'll get a list of rocketry prefectures located in the Lone Star State. Click on "launch ad" for a list of launch dates of that particular club.
The NSL link on the NAR site isn't active yet. I don't beleive they have their web site up yet. keep watch though.
Also, keep watch over the FlisKits web site. We hoping to publish our tour schedule this month and it will include all available links to events that we will be attending, and NSL is one of our planned visits.