My understanding of that section on Open Meetings is that carry at an Open Meeting is prohibited, but that prohibition does not apply to an LTC holder. In that it is referencing HB 1927 the prohibition does apply to someone carrying under the authority of HB 1927.
The parts on amusement parks and hospitals for LTC holders have been that way for a while now. The person carrying solely under HB 1927 is prohibited regardless of signage.
My understanding is the TABC Blue Sign is obsolete, 30.05 by itself only applies to non-licensed individuals. 46.15(o) is not a sign, but the section of the Penal Code you may be prosecuted under if a 46.03 sign is posted giving effective notice that the location is a prohibited place.
IANAL and these are only MY understandings.
