I'm a Texan, not a "damn outsider." Greg Knapp is a Dallas radio host, not a "damn outsider."
You have no reason to believe that a rally organized and promoted by a local radio station listened by 75,000 Dallas listeners would degrade into a "free for all."
I provided a link to KLIF's website, and they will update the page when they decide to update the page.
If Free Speech scares you, I suggest you stay away from downtown Dallas on Sunday, April 9. I was on a DART train when the cars were stormed by hundreds of Mexican teenagers screaming "MEXICO! MEXICO!" in my face.
I don't know if Greg Knapp is a native Texan or not. Unless Texans, native or not, rally against the massive influx of illegals, many of them may be hanging their hats in Tennessee, or Missouri, South Dakota, and other points distant from the Lone Star State 20-30 years from now.