"attendance at the seminars is by invitation only" in German Attendance at the seminars is by invitation only. Die Teilnahme an den Seminaren ist an eine Einladung gebunden. Detailed translations for "attendance at the seminars is by invitation only" Attendance at the seminars is by invitation only. Attendance at the seminars is by invitation only. Die Teilnahme an den Seminaren ist an eine Einladung gebunden.