DEMENEV AV, KUZNETSOV SY, MARCHUK MM, KUSHNEREV DY. IMPROVING EVENT MANAGEMENT EFFICIENCY THROUGH A DATA-DRIVEN APPROACH AND CLUSTER ANALYSIS. Современные проблемы сервиса и туризма. 2026;20(2):111-122. doi:10.22412/2414-9063-2026-20-2-111-122