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I found this on the George R Brown convention centers web sight 'rules and regulations'


"(1) Possession of Firearms is forbidden in the Facility with the exception of the following: (i) licensed peace officers and licensed honorably retired peace officers and (ii) exhibitors and patrons during duly licensed gun shows and (iii) individuals licensed by the State of Texas to carry concealed handguns.
(2) A “Firearm” is defined as any device designed, made, or adapted to expel a projectile through a barrel or cylinder by using the energy generated by an explosion or burning substance or pressurized air or gas or any device readily convertible to that use."
This is from the george r brown convention centers rules and regulations. Not sure about other venues.....