PLT OF C172 ON A VFR PLEASURE FLT WITHOUT A PREFLT BRIEFING UNKNOWINGLY ENTERED A TFR AREA OVER GLS BEFORE DISCOVERING AIR SHOW IN PROGRESS.

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ON APR/SUN/03; I FLEW FROM LVJ TO GLS. THE WX WAS PERFECT: BLUE SKY; NO WIND; ETC. I AM VERY FAMILIAR WITH THE AREA AND SINCE GLS IS ONLY 25 NM FROM LVJ; I DID NOT GET A BRIEFING. AS I APCHED GLS (APPROX 4 NM); I NOTICED NO OTHER ACFT ON THE ARPT FREQ (123.05). I LISTENED TO ASOS; AND BROADCASTED MY INTENTION TO LAND AT GLS. A FEW MINS LATER; I HAD MY RADIO CHKED BY UNICOM. AS I GOT CLOSER TO THE ARPT (APPROX 2 NM); I NOTICED ANOTHER ACFT OVER THE ARPT. LOOKING MORE CAREFULLY; I NOTICED THE OTHER ACFT PERFORMING ACROBATICS! I REALIZED I NEEDED TO GET OUT OF THERE. SO; I WENT AROUND GLS ON A RADIUS OF ABOUT 2 NM AND THEN RETURNED TO LVJ. I LANDED AT LVJ AND OBTAINED A BRIEFING WHICH CONTAINED A NOTAM STATING THE AIRSPACE CLOSED AT GLS DUE TO AN AIR SHOW. A 5 NM RADIUS AND A NEW FREQ HAD BEEN ESTABLISHED. I FAILED TO GET INFO ON GLS BEFORE GOING THERE; BUT I THINK THAT THE SHOW CTLRS COULD HAVE ADVISED ME ON THE STANDARD FREQ (123.05) WHEN I BROADCASTED MY INTENTIONS TO LAND THERE. AN ADVISORY ON THE STANDARD ARPT FREQ WOULD HAVE BEEN HELPFUL TO ACFT IN THE VICINITY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR CLARIFIED THAT HE CALLED GLS UNICOM BECAUSE IT WAS STRANGELY QUIET. THE OPERATOR CONFIRMED THAT HIS XMISSION WAS LOUD AND CLR; BUT FAILED TO ADVISE REGARDING THE STATUS OF THE ARPT. RPTR NOW REALIZES THAT THE UNICOM INDIVIDUAL HAS NO OFFICIAL STANDING AND WAS NOT RESPONSIBLE FOR DOING SO; BUT A HEADS UP WOULD HAVE BEEN NICE.