Robin Shin, Leigh Hornik, Kristia Peters and Karen Duffy-Simons (left to right) dance to music being played through silent disco headphones during the after party for the San Francisco Ballet's 2016 Opening Night Gala at San Francisco City Hall in San Francisco, Calif., on Thursday, January 21, 2015. The gala celebrated the opening of the company's 83rd season. Photo: Laura Morton, Special To The Chronicle