Germany and Poland are staging festivities in twin towns on their shared border to mark the 20th anniversary of Poland’s accession to the European Union. German Foreign Minister Annalena Baerbock and Polish Foreign Minister Radosław Sikorski are to meet in Frankfurt an der Oder and Słubice on Wednesday. The two are due to visit Słubice’s Collegium Polonicum academic institution on the Polish side on Wednesday, starting at 11:30 am (0930 GMT), then join a festival and cross the Oder Bridge to the German city of Frankfurt an der Oder. At the time, former German foreign minister Joschka Fischer a…