There are so many great tacos in Texas—as evidenced in our 50 Best Tacos in Texas list—that Texas Monthly decided to celebrate them with two new festivals this year. The first will go down on Saturday, May 31, in Grand Prairie, while the other will be held the following Saturday, June 7, in downtown Houston.I have the honor of curating these events as the magazine’s taco editor, but this isn’t my first rodeo, er, taco festival. I’ve run similar events for several years. The first go-round was in 2013, when a few friends and I hosted the North Texas Taco Festival. Then, from 2015 to 2019, I handpicked and managed the vendors of Taco Libre in Dallas and Austin. Each experience taught me valuable lessons—not…