The NRA meeting this year in Dallas will once again recognize the right to carry, as has been the case for the last several meetings. Here, with a link to the NRAAM site, is their official statement.
Firearms Policy for the NRA Annual Meetings & ExhibitsWith the recent display of a billboard stating "Kill the NRA", members in attendance may wish to consider carrying their defensive firearms.
Crowd at the NRAAM in Nashville, 2015
During the 2018 NRA Annual Meetings & Exhibits, lawfully carried firearms will be permitted in the Kay Bailey Hutchison Convention Center and the Omni Dallas Hotel in accordance with Texas law. When carrying your firearm remember to follow all federal, state, and local laws.
Other things to consider when traveling to Dallas-
If you drive, be sure you are aware of the carry laws in states you pass through. Two sources for information are Handgunlaw.us; and an app called Legal Heat, available for Android or Apple.
If you fly, be sure and follow the guidelines of both your airline and the TSA for checking a firearm in your checked baggage, never in carry-on.
TSA guidelines are available HERE.
Each airline has its own rules, too. Southwest rules are HERE.
Part of Delta's policy states, "All firearms checked as baggage must be picked up at the Baggage Service Office upon arrival at your final destination. ID will be required to claim your checked firearm." It has been reported that Delta puts zip ties on luggage that contains a firearm, so don't expect to have access to your firearm until after you gain access to a tool to remove the zip tie. Maybe a cheap multi-tool should reside in an outside pocket of your checked bag.
A case such as THIS, with a combo lock (no key to lose) would work well for the handgun. I suggest a second one for the ammo, in the same luggage.
One last thing, if your plane has an emergency landing in New York or New Jersey, and you take possession of your baggage that contains a firearm, DO NOT attempt to re-check that luggage to continue your flight. Rent a car and stow that locked baggage in the trunk and drive to Philly. Why, New York and New Jersey WILL put you in jail. If you find this strong suggestion hard to believe, do your own research.