PLT OF A PVT SMA LANDS WITHOUT CLRNC.

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ARRIVED INTO THE OSHKOSH AREA ON AN IFR FLT PLAN FOR THE LAST DAY OF THE SHOW AUG/XX/95. TALKING WITH ZAU; WE BROKE OUT 3 OR 4 MI E OF WITTMAN FIELD AND CANCELED IFR. CHICAGO TOLD US TO CONTACT THE TWR AND WE SWITCHED OVER TO THE OSHKOSH FREQ ON A 3 MI FINAL. THE ACTUAL PROCS IN GENERAL DURING THE SHOW ARE TO NOT XMIT ON THE TWR FREQ UNLESS ASKED; BUT INSTEAD TO JUST FOLLOW DIRECTIONS. SO WHEN I WAS UNABLE TO TALK WITH ATC DUE TO FREQ CONGESTION I WASN'T TOO CONCERNED AT FIRST. WE PROCEEDED INBOUND AND STILL THE CONVERSATION BTWN ANOTHER PLANE AND ATC CONTINUED. WE ACTUALLY FLEW ABOUT 3 MI AND THEN FINALLY LANDED ON THE RWY WITHOUT GETTING A WORD IN EDGEWISE. AS WE LANDED I REALIZED THAT THIS COULDN'T BE A VERY SAFE PROC AND THAT I SHOULD HAVE JUST 'FORCED' IN A XMISSION; EVEN IF ON TOP OF THE OTHER PLT. CONTRIBUTING WAS THE PRESSURE TO CANCEL IFR BY CHICAGO; ALTHOUGH NOT THEIR FAULT; AND TRYING TO GET THE PLANE DOWN FROM A HIGH AND FAST APCH WITHOUT TEARING IT UP; OR SOMETHING ELSE EVEN MORE STUPID THAN NOT COMMUNICATING AS WELL AS I SHOULD.