Nope.
From the Dallas Convention Center FAQ:
http://www.dallasconventioncenter.com/contact-us/faqs/
What is your Weapons Policy?
The Kay Bailey Hutchison Convention Center Dallas follows all applicable State and local laws regarding weapons in the facility. Weapons of any kind are not allowed at collegiate, religious, or high school events pursuant to Texas Penal Code (§46.03 & §46.035). Event organizers may further restrict weapons based upon their association’s/ organization’s rules and regulations.
As I stated is legal to carry within the convention center, this is a DSC policy.
Have you confronted DSC with this info?