April 11, 12: Strauss operetta performed for Mom’s Weekend March 18, 2014 PULLMAN, Wash. – The lighthearted operetta “Die Fledermaus” by Johann Strauss will be performed with full orchestra for Mom’s Weekend at Washington State University at 8 p.m. Friday, April 11, and 2 p.m. Saturday, April 12, in Bryan Hall.