LOW APCH AND LNDG WITH PAX AT ARPT DURING THE AIRSHOW.

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WE WERE SCHEDULED TO FLY ON A ROUTINE COMMUTER FLT FROM MKE-GRR-MKG-MKE. BECAUSE THE LEG BTWN GRR AND MKG IS ONLY A 10 MIN FLT; I ASKED THE FO/PNF WHILE ENRTE TO GRR; IF HE WOULD ALSO PICKUP MKG ATIS. IT WAS THEN THAT I LEARNED THERE WAS AN AIRSHOW IN PROGRESS AT MKG. THIS CONCERNED ME GREATLY BECAUSE I ALSO LEARNED THE ACTIVE RWY WAS THE AIRSHOW'S DEMONSTRATION RWY. I BECAME VERY CONCERNED ABOUT THE HIGH LEVEL OF ACTIVITY CTRED NEAR THE ACTIVE RWY. UPON LNDG IN GRR I MADE 3 UNSUCCESSFUL ATTEMPTS TO CONTACT COMPANY PERSONNEL TO GET SOME SORT OF FEELING ABOUT THE AIRSHOW. I ENVISIONED ACFT DISPLAYS ON BOTH SIDES OF THE RWY AND PEOPLE WALKING ACROSS THE RWY BACK AND FORTH BTWN DISPLAYS; ACFT PARKED TOO CLOSE TO THE RWY ETC. I WAS ADDITIONALLY CONCERNED THAT ALL TXWYS LEADING TO THE TERMINAL RAMP WERE CLOSED. I HAD NEVER FLOWN INTO AN AIRSHOW ENVIRONMENT BEFORE AND WAS UNFAMILIAR WITH THE USAGE OF 'FOLLOW ME' TRUCKS. AFTER CONFERRING WITH MY EXPERIENCED FO WHILE STILL ON THE RAMP IN GRR; I DECIDED TO EXECUTE A LOW; SLOW APCH OVER THE ACTIVE RWY IN LNDG CONFIGN LESS LNDG FLAPS. THE FO WOULD BE THE PF TO MAXIMIZE MY ABILITY TO OBSERVE THE SIT. WHILE STILL IN GRR I MADE SEVERAL RADIO CALLS TO PREPARE THE CTLRS FOR OUR LOW APCH WITHOUT DISTURBING THE AIRSHOW (GRR CLRNC DELIVERY; MKG APCH CTL WHILE ENRTE; COMPANY OPS IN MKG AND GRR; AND AGAIN WITH MKG TWR). I ALSO BRIEFED THE PAX THAT WE MAY DO A LOW APCH (THERE WERE 7 PAX ABOARD). I DID NOT THINK TO USE THE LANDLINE TO CONTACT MKG TWR AT THIS TIME TO GET A MORE THOROUGH BRIEFING OF THE SIT. UPON ARR INTO THE MKG ARPT AREA I ASKED THE TWR FOR A COMPLETE BRIEF OF ALL THE TFC IN THE AREA AND WAS SURPRISED TO LEARN ABOUT THE HELIS LNDG AND TAKING OFF VERY NEAR THE THRESHOLD OF RWY 24. THIS WAS NOT WISE IN MY OPINION. THE LOW APCH WAS EXECUTED WITHOUT INCIDENT; AND MOST OF MY CONCERNS WERE APPROPRIATELY ADDRESSED. THIS LOW APCH SERVED AS AN EXPERT TOOL FOR THE SIT AT HAND. UPON LNDG; SOME OF MY CONCERNS ABOUT PEOPLE WALKING SOMEWHAT FREELY WERE REALIZED AND TAXIING BECAME SOMEWHAT STRESSFUL. IT WAS BROUGHT TO MY ATTN THAT THE FAA WAS NOT PLEASED WITH THE LOW APCH; ALTHOUGH THEY HAD NO IDEA OF MY GREAT CONCERN FOR SAFETY. THIS LOW APCH WAS IN NO WAY RECKLESS ENDANGERMENT OF UNWILLING PAX. WE WERE SLOW (150 KIAS) AND IN LNDG CONFIGN WITH A VERY NORMAL RECOVERY PROCESS SIMILAR TO A GAR ONCE PAST THE ACTIVITY ON THE GND. DESPITE THE FAA'S CONCERNS; I FEEL AS THOUGH I PROPERLY EXECUTED MY AUTH AND RESPONSIBILITY FOR SAFETY AS PIC. I DO; HOWEVER; HAVE RECOMMENDATIONS FOR AVOIDING SUCH UNUSUAL WORKLOAD ON PLTS FLYING SCHEDULED ACRS INTO AIRSHOW SMALLER THAN THE OSHKOSH AIRSHOW. SIMPLY PRINT A DETAILED LAYOUT OF THE SHOW'S ACTIVITY ON THE GND AND THE TXWYS CARRIERS SHOULD EXPECT TO UTILIZE TO THE RAMP AND DISTRIBUTE THE MEMOS VIA NORMAL COMMERCIAL CHART REVISIONS ONE MONTH PRIOR. THIS COULD EASILY BE DONE FOR ALL AIRSHOWS WITH SCHEDULED AIR SVC EXPECTED AND WOULD ALLEVIATE FUTURE FLCS FROM EXPERIENCING THE SAME CONCERNS I FELT.