Probably the best place to go for lunch is the Reading Market Terminal next door to the Marriott and the Convention Center. My friends from Philly say this, and I agree with them after going there both Sunday and Monday. I could see Italian artisan meat shops, Indian food, Chinese food, and American food. But there is much much more inside. I even found some fresh goat milk, if that catches your interest, at the Fair Food Farmstand inside.
For dinner I strongly recommend an Italian place a few blocks away, Gran Caffe L’Aquila. We went there as a UT Austin group last night, and the food as well as the service is great. You must have some gelato after your dinner!