NMAC BTWN 2 SMA WHILE ON A SIGHTSEEING OP NEAR WATSONVILLE; CA; WHERE A SPECIAL EVENT WAS IN PROGRESS. BOTH PLTS WERE VIEWING THIS BUT ONLY ONE; THE RPTR; USED HIS VHF AND EXTERIOR LIGHTING.

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DEPARTED SNS ARPT AFTER DOING ONE PRACTICE APCH/TAXI BACK. APCHED HOLLISTER FROM SW AT INITIAL ALT OF 3200 FT (FOR XING GABILAN RANGE). DSNDED TO 1500 FT UNTIL APPROX 7 MI SW OF HOLLISTER ARPT. NEVER CAME WITHIN 3 MI OF HOLLISTER ARPT. XMITTED OVER TRES PINOS (APPROX 5 MI OF HOLLISTER ARPT) TOWARD DOWNTOWN HOLLISTER ARPT AT 1500 FT. BEFORE ARRIVING AT DOWNTOWN CALLED HOLLISTER CTAF (123.0) AND STATED 'CESSNA OVER HOLLISTER DOWNTOWN RETURNING DIRECT SNS.' I HAD TO WAIT FOR SEVERAL MOMENTS BECAUSE A BARON AND ANOTHER ACFT WERE CIRCLING FOR LNDG. BEFORE BEGINNING DSCNT INTO HOLLISTER TURNED ON ALL LNDG/NAV/FLASHERS LIGHTS. AFTER DEPARTING DOWNTOWN ON A SSW HEADING AND CLBING GRADUALLY A PIPER OR TAMPICO (RED STRIPES OVER WHITE) PASSED R TO L AND PERHAPS 200 FT HIGHER IN FRONT OF MY PLANE. THIS ACFT WASN'T ON THE CTAF; DIDN'T HAVE ANY FLASHING LIGHTS AND APPEARED TO BE DSNDING AND IN A SLIGHT L-HAND BANK (APPARENTLY TO OBSERVE THE SPECIAL EVENT IN DOWNTOWN HOLLISTER). I SHOULD HAVE BEEN EXPECTING OTHER TFC AND THE OTHER ACFT SHOULD HAVE BEEN TALKING ON THE CTAF AND ALSO LOOKING FOR TFC.