ACR MLG UNAUTH LNDG WHEN FLT CREW FAILED TO CALL TWR ON SECOND APCH FROM A GO AROUND CAUSED BY SLAT DISAGREEMENT LIGHT.

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APCHING RWY 26L DEN; ABOUT 3 MI FINAL; WE HAD A SLAT DISAGREE LIGHT. EXECUTED A GO AROUND TO REVIEW CHKLIST. AFTER REVIEWING CHKLIST ON DOWNWIND AND REPOSITIONING FLAPS; DISAGREE LIGHT WENT OUT. WE THOUGHT: THIS WILL BE A NORMAL LNDG NOW; NO PROB. TURNED ABOUT A 4 MI FINAL FOR RWY 26L. SLAT DISAGREE LIGHT CAME ON AGAIN WITH STICK SHAKER. CAPT CALLED FOR CHKLIST AGAIN AND I WENT THROUGH IT AS QUICKLY AS I COULD. WAS HURRIEDLY TRYING TO FIND A VREF SPD FOR HIM TO SET FROM THE CHART IN THE BOOK. WE LANDED FLAPS 28 DEGS WITH VREF ABOUT 151 KTS. ONLY PROB: I FORGOT TO CALL DEN TWR FOR PERMISSION TO LAND. UPON LNDG SLAT DISAGREE LIGHT WENT OUT. I THINK IT WAS AN INDICATOR PROB AND NOT AN ACTUAL DISAGREEMENT. WE SHOULD HAVE DONE ANOTHER GO AROUND OR POSSIBLE EXTENDED OUR DOWNWIND LEG TO GIVE OURSELVES MORE TIME TO DIGEST THE CHKLIST. COMPANY CHKLIST IS ALMOST 2 PAGES LONG AND TAKES A WHILE TO DIGEST. HAD I NOT BEEN RUSHED I WOULD HAVE HAD TIME TO CALL DEN TWR. IN A 2-M COCKPIT; THE F/O ACTS AS F/O AND F/E AND HE CAN GET OVERLOADED EASILY.