.page-owcal-conference-2021 #zone-content .node-programs ul.program-tabs, 
.page-owcal-conference-2021-with-zoom-links #zone-content .node-programs ul.program-tabs {
  display:none;
}
.page-owcal-conference-2021 h2.about-header, 
.page-owcal-conference-2021-with-zoom-links h2.about-header {
    display:none;
}