PLT OF AN SMA FAILED TO CONTACT TWR DURING ARR AND LNDG AT A CTLED ARPT THAT IS USUALLY UNCTLED.

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DUE TO AN AIRSHOW AT ANNISTON; AL; ON OCT/XO-XP/94; A TEMPORARY TWR WAS SET UP AND IN OP. I CHKED NOTAMS PRIOR TO DEP BUT WAS NOT AWARE OF THE TWR OP. INBOUND TO ANNISTON I ATTEMPTED CONTACT ON UNICOM FREQ. THERE WERE 4-5 OTHER ACFT DOING THE SAME. NO LUCK FOR ANY OF US. I STARTED ATTEMPTING CONTACT ABOUT 30 NM OUT. UPON ARR WITH NO CONTACT I OVERFLEW THE AIRFIELD WELL ABOVE PATTERN ALT TO CHK WINDS AND LOOK FOR TFC. SEEING THAT TFC WAS LNDG ON RWY 5; I WENT N OF THE FIELD; DSNDED TO PATTERN ALT AND ENTERED L DOWNWIND. I CALLED DOWNWIND; BASE; AND FINAL. LNDG AND TAXI WERE UNEVENTFUL. AFTER LNDG I WAS TOLD THERE WAS A PROB AND LOOKED FOR THE TWR SUPVR. HE TOLD ME ABOUT THE TWR OP AND ALSO SAID THAT I CUT SOMEONE OUT OF THE PATTERN ON FINAL. I SOUGHT OUT THE OTHER PLT. HE SAID HE SAW ME ENTER DOWNWIND; TURN BASE; AND TURN FINAL. HE THOUGHT I WOULD ROLL OUT BEHIND HIM. WHEN HE SAW THAT I WASN'T GOING TO GO BEHIND HIM; HE MANEUVERED HIS ACFT TO AVOID A CONFLICT. HE ESTIMATED THAT WE CLOSED TO 500 FT LATERALLY. I DIDN'T SEE HIM AS HE WAS PROBABLY UNDER MY NOSE. (I WAS FLYING A PITTS SPECIAL.) TWR SAID IT DIDN'T LOOK TOO CLOSE BUT THEY SENT THE OTHER ACFT AROUND AS A PRECAUTION. I BELIEVE THAT THE PROB AROSE BECAUSE I WAS NOT AWARE OF THE TWR FREQ. SEVERAL OTHER PLTS I TALKED WITH WERE ALSO UNAWARE OF IT. ONE OF THE CONTRIBUTING FACTORS WAS THAT THIS WAS A TEMPORARY TWR. NORMALLY ANB IS AN UNCTLED FIELD. HOW IT WAS DISCOVERED IS MENTIONED IN THE NARRATIVE ABOVE. CORRECTIVE ACTIONS: THE FAA MENTIONED THAT THERE HAVE BEEN PROBS WITH NOTAM DISSEMINATION. THAT MAY HAVE BEEN PART OF THE PROB. I COULD HAVE CALLED FSS'S ENRTE TO UPDATE NOTAMS. I MAY HAVE GOTTEN THE WORD CLOSER TO ANB. OBVIOUSLY; BETTER VISUAL LOOKOUT WOULD HAVE ALSO HELPED.