The service will combine the traditions of the West and Eastern Churches. There will be much music including singing by the Bach Choir of St. Petri, the Roman Catholic Schola Cantorum and the choir of the Russian Orthodox Church of St Johannes von Kronstatt. Bishop Gerhard Ulrich will preach.
Saint Ansgar was an Archbishop of Hamburg-Bremen. Through his "Mission to bring Christianity to the North", he became known as the "Apostle of the North".
For further information (in German) click here.