Grand Duke Henri presumably received a few new ambassadors to the Grand Duchy in audiences today. At least he did so with Austria's new ambassador to Luxembourg Gregor Schusterschitz, who presented his letter of credence to the Grand Duke today at the palais grand-ducal. Usually there are a number of such audiences during the given day.
Prince Nikolaus was in Nancy on Wednesday where he participated in a conference titled "European Journey - From the Congress of Vienna to the European Union" in his capacity as president of the European Society Coudenhove-Kalergi. He also signed the French city's golden book. See the full schedule here and two pictures here and here.
Hereditary Grand Duke Guillaume was present at the 25th anniversary of the Chamber of Commerce Italo-Luxembourg on Wednesday evening. Also in attendance were Deputy Prime Minister Etienne Schneider and Minister of Finance Pierre Gramegna. (Update: Pictures here.)
Prince Philipp was in Geneva a few days ago where he met the Secretary General of the World Federation of United Nations Associations and also the participants of the Leadership Training Program. Pictures on Facebook.
Prince Max hosted some kind of gala dinner about a week ago at the Princely Family's Gartenpalais in Vienna.