The Jargon File (version 4.4.7, 29 Dec 2003):

copyparty
 n.

    [C64/amiga demoscene] A computer party organized so demosceners can meet
    other in real life, and to facilitate software copying (mostly pirated
    software). The copyparty has become less common as the Internet makes
    communication easier. The demoscene has gradually evolved the demoparty
    to replace it.