ERRONEOUS PENETRATION OF CLASS D AIRSPACE.

Narrative

FLT WAS FROM BEDFORD; MA TO PROVINCETOWN; MA OVER NORWOOD ARPT AND WEYMOUTH NAVAL STATION AT 3000 FT; JUST UNDER BOSTON CLASS B AIRSPACE (70/40 RING). NORMALLY THIS WOULD BE JUST ABOVE WEYMOUTH CLASS D AIRSPACE; BUT THE ARPT WAS NOTAMED FOR AN AIRSHOW EXTENDING CLASS D AIRSPACE TO 6000 FT. THE ACFT PENETRATED CLASS D AIRSPACE. THE PLT HAD OBTAINED A PREFLT BRIEFING BY DUAT BUT THE NOTAM FOR THE AIRSHOW WAS NOT NOTICED. I RECEIVED A CALL AFTER LNDG AND DISCUSSED THE VIOLATION WITH BOSTON ATC. THE VIOLATION OCCURRED DUE TO INADEQUATE PREFLT BRIEFING. IT COULD ALSO HAVE BEEN AVOIDED BY FILING IFR; REQUESTING FLT FOLLOWING; OR BY REQUESTING CLRNC THROUGH CLASS D AIRSPACE EVEN THOUGH THE PLT WAS AT AN ALT WHERE HE DID NOT BELIEVE IT NECESSARY. A CONTRIBUTING FACTOR TO THE INADEQUATE BRIEFING WAS THE EXTREME CLUTTER OF NOTAMS IN THE DUAT MOST OF THEM COVERING AREAS FAR REMOVED FROM THE AREA AT INTENDED FLT. IT WOULD ALSO BE HELPFUL TO FURTHER NOTIFY ITINERANT TFC BY POSTING ANNOUNCEMENTS IN OTHER LCL ARPTS.