Grand Duke Henri is scheduled to attend a First World War commemoration in Liège on August 4th. The battle of Liège was the opening engagement of the German invasion of Belgium and the first battle of World War I. The event will also be attended by King Felipe and Queen Letizia of Spain, the Duke and Duchess of Cambridge as well as the presidents of France, Germany, Austria, Ireland, Albania, Serbia, Slovenia, Slovakia and Montenegro. The United States of America, the Netherlands, Latvia, New Zealand, Macedonia, Estonia, Ukraine, Switzerland and Canada will also be represented by official delegations. I assume that the event will be hosted by the Belgian King and Queen.
Source: Today in Liege