Ludwigsburger Schloßtage ("Palace Days"). They gained national significance when President Theodor Heuss attended a production of Mozart's Titus two years later. The concerts were named Ludwigsburger Schloßfestspiele in 1966, and were internationally known as the Ludwigsburg Festival. In 1980, the state of Baden-Württemberg made the festival an official state event. On 9 September 1962, Charles de Gaulle delivered his "speech to the German youth" in the courtyard of Ludwigsburg Palace to 20,000 people. Restorations were undertaken in the 1950s and 1960s and again in the 1990s, in time for the palace's tricentenary in 2004. The anniversary was commemorated by the state government with three new museums. On 19 October 2011, Minister-President Winfried Kretschmann hosted a reception for the U.S. Army's 21st Theater Sustainment Command at the palace, which was attended by John D. Gardner, former deputy commander of EUCOM, and , commander of all German troops in Baden-Württemberg. Ludwigsburg appeared again on Federal postage stamps in the Burgen und Schlösser series. The 50th anniversary of Charles de Gaulle's speech at Ludwigsburg was celebrated on 22 September 2012 and included appearances by German Chancellor Angela Merkel, Minister-President Kretschmann, and French President François Hollande. Merkel and Hollande both spoke at the event, the former directly referencing de Gaulle's speech in French. A painting of Frederick the Great on display was found to be a rare original by Antoine Pesne in November 2017. Michael Hörrmann – the director of the – valued the portrait at a minimum of €1 million. Baden-Württemberg's Minister of Finance, Edith Sitzmann visited Ludwigsburg to see the painting and attend a press conference, where she spoke about the cultural importance of Ludwigsburg Palace. In 2017, 350,642 people visited Ludwigsburg Palace. By March 2020, Staatliche Schlösser und Gärten Baden-Württemberg plans to have spent €4 million to furnish the Neuer Hauptbau as it would have been during the reign of King Frederick I. To this end, about 500 paintings, 400 pieces of furniture, and 500 lamps, clocks, and sculptures – will be sourced, sorted, and restored. As a result of the 2019-20 coronavirus pandemic, Staatliche Schlosser und Garten announced on 17 March 2020 the closure of all its monuments and cancellation of all events until 3 May. Monuments began reopening in early May, from 1 May to 17 May. Architecture Ludwigsburg Palace's Baroque architecture was built under Eberhard Louis from 1704 to 1733 and is characterized by a great deal of