The Viennese Opera Ball takes place on February 28, 2019, with performances by several prestigious troupes. /VCG Photo

Opera singers including Anna Netrebko and Yusif Eyvazov perform songs during the opening ceremony of the Opera Ball in Vienna. /VCG Photo

Dancers of the Wiener Staatsballett perform during the opening ceremony of the Opera Ball in Vienna, Austria, February 28, 2019. /VCG Photo

Each year, the Viennese Opera Ball supports charitable projects and international cultural exchanges. /VCG Photo