gistfile1.css

//Hide all schedule items by default
div.schedule-item {
  display: none;
}

//After javascript has had a chance to act, reveal the schedule items
body.timezone-est div.schedule-item {
  display: block;
}

//This CSS rule applies in the same instant as the previous CSS rule, so as soon
//as javascript completes, only the unrestricted schedule items are revealed
body.timezone-est div.schedule-item.restricted-timezone-est {
  display: none;
}