TexasCHLforum.com

Steve:
If the convention is held inside a U/H building, you can't carry. TPC §46.03(a)(1) prohibits all firearms on the "premises" of a school, as "premise" is defined, and the prohibition applies whether or not school activities are occurring in the building.

The only time ongoing activities becomes an issue is when we are dealing with school grounds rather than buildings. See the statute below.

Regards,
Chas.

§ 46.03. PLACES WEAPONS PROHIBITED. (a) A person commits
an offense if the person intentionally, knowingly, or recklessly
possesses or goes with a firearm, illegal knife, club, or
prohibited weapon listed in Section 46.05(a):

(1) on the physical premises of a school or
educational institution, any grounds or building on which an
activity sponsored by a school or educational institution is being
conducted, or a passenger transportation vehicle of a school or
educational institution, whether the school or educational
institution is public or private, unless pursuant to written
regulations or written authorization of the institution;