Bamiga Sector 1 Copyparty 1989 was held in Nestelrode, Holland by Switch/Bamiga Sector 1. The party was promoted a lot in BS1 cracktros, see a.o. 45er Menumaker for information. Cracker Journal 13 (july 1989) reported "18 and 19 november 1989 Bamiga Sector One Copy Party Holland Organized by Switch.", and Cracker Journal 16 (october 1989) followed up with "Bamiga Sector One Copy Party on 18.11.89 also in Holland".
There were two problems at this party; one thing was that the fuses seemed to be blowing constantly, and the other was that it was raided by the police! In a joint venture with Dutch and French police (working with software house Titus) they raided the party with six police cars, and 100's of disks were confiscated. Many destroyed their disks, there was total panic. In the end, everybody had to be registered by the police before leaving, and disks, hardware and adress books were confiscated.
Some background information on the supposed reasons of the bust are related in Criminal #1.