MD900 HELI PLT PENETRATES OPEN AIR ASSEMBLY STADIUM RESTR AIRSPACE IN SEATTLE; WA.

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FLEW NEAR A STADIUM WHILE A SPORTING EVENT WAS TAKING PLACE. REF: FDC3/1862; SPECIAL NOTICE. THE MISSION WAS TO TAKE THE OWNER OF THE HELI AND HIS GUEST ON A SIGHTSEEING FLT E OF SEATTLE FROM BOEING FIELD. 1 HR EARLIER; I HAD FERRIED THE ACFT FROM VICTORIA; BC. A WX BRIEFING AND A FLT PLAN WAS FILED WITH CYKA; CANADIAN FSS. UPON ARR; I WAS TOLD OF THE SIGHTSEEING FLT. WHILE PREPARING THE ACFT; THE OWNER ARRIVED. HE INFORMED ME THEN THAT IN ADDITION TO THE MOUNTAINS; HE WANTED TO FLY BY DOWNTOWN SEATTLE. THE FLT PATH WAS CHANGED SEVERAL TIMES BECAUSE OF ADDITIONAL REQUESTS FROM THE OWNER. AFTER LEAVING THE DOWNTOWN AREA AND FLYING TOWARDS THE MOUNTAINS AT 1200 FT MSL; I NOTICED A FULL FOOTBALL STADIUM TO THE L OF THE ACFT NEAR THE RTE OF FLT AT APPROX BTWN 1 AND 2 NM. I IMMEDIATELY TURNED AWAY FROM THE STADIUM THINKING THAT IT MIGHT BE ONE COVERED UNDER THE BLANKET NOTAM CONCERNING LARGE SPORTING EVENTS. I UNDERSTAND THAT A REVIEW OF ALL PERTINENT INFO AND A WX/NOTAM BRIEFING SHOULD BE OBTAINED PRIOR TO FLT. IN THIS CASE A WX BRIEFING WAS RECEIVED FOR THE TIME BOTH FLTS WERE TO HAPPEN; BUT A NOTAM BRIEFING WAS NOT. EVEN IF I HAD RECEIVED A BRIEFING FROM SEATTLE FSS; I MIGHT NOT HAVE BEEN INFORMED OF THE GAME BEING PLAYED. SUBSEQUENTLY; I HAVE CALLED SEATTLE FSS 3 TIMES AND HAVE GOTTEN 3 DIFFERENT BRIEFERS. ONLY ONE COULD TELL ME ABOUT THE SPECIFIC EVENT HAPPENING LOCALLY AND EVEN HE DIDN'T HAVE THE EXACT LOCATION OF THE STADIUM OR THE TIME OF THE GAME. IF ONE WERE NOT A SPORTS FAN; IT WOULD BE VERY DIFFICULT TO KNOW WHEN AND WHERE THESE SPORTING EVENTS WERE TAKING PLACE. THE BRIEFERS ONLY HAVE GENERALIZED INFO ABOUT THIS NOTAM. CORRECTIVE ACTION: PLTS SHOULD OBTAIN A DETAILED BRIEFING PRIOR TO EACH FLT AND BRIEFERS SHOULD BE GIVEN DETAILED INFO OF EACH EVENT TAKING PLACE DURING THAT DAY TO DISSEMINATE.