PLT OF A C206 ATX HAD CONFLICT WITH A SPARTAN EXECUTIVE ANTIQUE ACFT DURING ENTRY TO AN UNCTLED ARPT TFC PATTERN DURING PRE AIRSHOW PRACTICE AND SPECTATORS' ARR.

Narrative

ENTERING THE PATTERN AT RKD ARPT; DURING THE PRACTICE AND ARR TIME OF AIRSHOW ACFT AND SPECTATOR ACFT I WAS FORCED TO MODIFY MY ENTRY INTO THE PATTERN BECAUSE OF TFC SATURATION; MULTIPLE RWYS BEING USED; ACFT WITHOUT RADIO; AND FREQ SATURATION. THE OTHER ACFT SAID THAT HE HAD TO CHANGE HIS DIRECTION OF FLT TO AVOID MY ACFT. I ALSO HAD TO MODIFY MY PATTERN AND DIRECTION OF FLT EACH TIME I ENTERED THE PATTERN THAT DAY. IF I WAS NOT REQUIRED TO BE FLYING INTO ROCKLAND ARPT DURING THAT TIME; I PROBABLY WOULD NOT HAVE BECAUSE OF SO MUCH CONGESTION IN THE PATTERN. DURING THE DAY I HAD TO GO AROUND 4 TIMES; 3 TIMES ON 1 ENTRANCE INTO THE PATTERN FOR LNDG. ALSO OUR OTHER ACFT FLYING ON OR ABOUT THE SAME TIME WAS FORCED TO GO AROUND AT LEAST ONCE DURING THE DAY. SINCE I HAVE FLOWN OUT OF ROCKLAND ARPT I HAVE NEVER HAD ANY PROBS EXCEPT DURING THE AIRSHOWS. CORRECTIVE ACTIONS COULD BE: 1) USE OF ONLY 1 RWY. 2) ACFT REQUIRED TO HAVE RADIOS DURING TIMES PRIOR TO ARPT CLOSURE FOR AIRSHOW. (AFTER RE-OPENING ALSO.) 3) POSSIBLE TEMPORARY CTL TWR. 4) LIMIT AIRSHOW ACFT FROM PRACTICING PRIOR TO ARPT CLOSURE.