I truly HOPE that you have a couple of battalions of Mexican ARMY to protect you. = My adult/adopted daughter was born/raised in Mexico City, still has blood family down there & she is now AFRAID to go to visit her sisters/brothers, who are in the DF, Jalisco & Baja California.
My saddle & boot maker (I've been his customer for 3+ decades.) told me NOT to come back to Saltillo to have my harnesses/saddles/tack repaired and/or to buy a new Charro saddle as, "Senor, it is too dangerous for Americanos to be here.".
(I used to spend about half my time in Mexico, when I worked the border area & have many friends in the State & Federal Judicial Police. = BUT I never cross the border anymore.)
May I gently suggest that your men's mission group go to RED CHINA, NORTH KOREA, AFGHANISTAN, IRAN, SOMALIA, YEMEN or another similar "garden spot", as those places would be SAFER???
just my OPINION, sw