SMA DIVERTING DUE TO ARPT CLOSURE FOR AIRSHOW ENTERS ATA WITHOUT CLRNC. CLOSE PROX TO PERFORMING ACFT.

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AFTER A VFR DAY FLT I RETURNED TO MY HOME FIELD. ABOUT 10 MI OUT I TUNED THE AWOS AND WAS SURPRISED TO LEARN THAT THE FIELD WAS CLOSED DUE TO AN AIR SHOW DEMO. SINCE I HAD 30 MINS TO PASS BEFORE THE FIELD RE-OPENED; I DECIDED TO DIVERT TO AN ALTERNATE AND WAIT IT OUT ON THE GND. IN ORDER TO GET THIS ALTERNATE I NEEDED TO THREAD MY WAY BTWN A RESTR AREA AND MY HOME FIELD'S ATA. DURING THIS TIME; I THINK I INADVERTENTLY STRAYED INTO THE ATA. AS I WAS HDG OUT OF THIS AREA I NOTICED THAT THE ACFT PERFORMING THE DEMO FLT WAS AT MY ALT AND HEADED FOR ME. I VEERED R; AS DID HE AND WE PROBABLY PASSED WITHIN 1 MI OF EACH OTHER. 2 MAIN FACTORS HAD BEARING ON THIS INCIDENT. FIRST OF ALL; I FULLY EXPECTED TO COMPETE MY FLT AT MY HOME ARPT. I WASN'T PREPARED TO DIVERT TO AN ALTERNATE. I HAD RECEIVED A COMPLETE PREFLT BRIEFING; INCLUDING NOTAMS; AND NO MENTION WAS MADE OF THE FIELD CLOSING. I WAS ADVISED THAT THE AIR SHOW DEMOS WOULD BE GOING ON THROUGHOUT THE DAY AND EXPECTED TO BE EXTRA VIGILANT ON ARR. SECOND; ALTHOUGH I HAVE ALMOST 400 HRS; I HAVE BEEN OUT OF FLYING FOR THE PAST 11 YRS. I ONLY RECENTLY PASSED MY BFR AND REJOINED THE FLYING COMMUNITY. THIS WAS MY FIRST TRIP WITHOUT AN INSTRUCTOR.