The Woodlands Waterway Marriott has never been posted as far as I know. I have carried there multiple times. I don't know if he has Secret Service protection, though - as the presumptive nominee he may already qualify. If so, I bet they'd be a little more strict than the average Texas DPS Officer.
Will I go? No, not so much. I'll hold my nose and vote for him in the fall - and - I'll convince others to do the same. But that's all I'm willing to do.
Your best option for personal security is a lifelong commitment to avoidance, deterrence, and de-escalation.
When those fail, aim for center mass.
I'm pretty confident you will not be allowed to carry. The secret service frowns on that. As the folks set the NRA meeting.
Note: Me sharing a link and information published by others does not constitute my endorsement, agreement, disagreement, my opinion or publishing by me. If you do not like what is contained at a link I share, take it up with the author or publisher of the content.