@mixin evtclass($name, $light, $dark) {
  .evt-$name,
  .fc-agenda .evt-#{$name} .fc-event-time,
  .fc-agenda .evt-#{$name}  .fc-event-title,
  .fc-agenda .evt-#{$name} .fc-event-bg,
  .custom a {
      background-color: $light;
      border-color:$light;
      color: white;
      opacity: 1;
      filter: alpha(opacity=0);
  }
  .fc-agenda .evt-#{$name} .fc-event-time {
    background-color: $dark;
  }
  .fc-agenda .evt-#{$name} .fc-event-skin, .fc-event-skin.evt-green {
    border-color: $dark;
    background-color: $dark;
  }
}

@include evtclass("magenta", #f0f, #303);