FK10 CREW HAD TRACK DEV WHEN GIVEN A STADIUM VISUAL APCH AT THE LAST MIN.

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DID NOT INTERCEPT LOC. ON A CLR VMC DAY AT APPROX 11000 FT DSNDING TO 8000 FT; APPROX 30 MI S OF DFW ON THE CQY ARR; WITH A POSSIBLE TAILWIND LNDG SIT AT DFW (WIND 240 DEGS AT 15 KTS GUSTING TO 25 KTS); WE WERE TOLD (WHAT SEEMED TO ME TO BE LATE) TO EXPECT A STADIUM VISUAL TO RWY 31R. WE REVIEWED PAGE 69-1 WHICH HAD NO LOC FREQ AND MY FO RPTED HE HAD THE TEXAS STADIUM IN SIGHT. I WAS VERY BUSY DOING THE BEFORE LNDG CHKLIST; PREPARE FOR LNDG PA; AND REVIEWING THE 69-1 PLATE (THIS WAS THE FIRST OR SECOND TIME TO SHOOT THIS APCH). ATC INSTRUCTED US TO INTERCEPT THE RWY 31R LOC (VISUAL APCH). I ASKED THE FO TO LOOK UP THE FREQ WHICH HE GAVE TO ME (HE WAS FLYING) AND I INADVERTENTLY SET IN THE WRONG FREQ. I DID NOT HAVE TIME TO VERIFY THE FREQ; BUT PROBABLY WOULD HAVE IF I HAD NOT BEEN LED TO THINK THAT WE WERE FLYING THE STADIUM VISUAL WITH NO LOC FREQ PRINTED ON PAGE 69-1. LUCKILY I HAD PUT RWY 31R ILS IN THE FMC AND NOTICED WE HAD PASSED THROUGH RWY CTRLINE AND SELECTED THE RIGHT FREQ AND CORRECTED BACK TO RWY CTRLINE. LNDG WAS UNEVENTFUL AND A CALL TO REGIONAL APCH AFTERWARD VERIFIED (THROUGH THE SUPVR) THAT NO LOSS OF SEPARATION OCCURRED. MY RECOMMENDATION IS THAT IF IN THE FUTURE RWY 31R LOC FREQ BE PUT ON STADIUM VISUAL IF ATC WANTS US TO TRACK IN ON THE LOC TO AVOID DALLAS LOVE AIRSPACE UNTIL WE GET CLOSE ENOUGH TO SHOOT THE VISUAL APCH. I SUGGEST THIS BECAUSE WHEN I HAVE AN APCH MARKED WITH MY MARKER AND THEN I HAVE TO FIND ANOTHER APCH AMONG THE 30 (I COUNTED THEM).