Target cell based on event type?

You can use onBeforeCellRender event like this:

//...
dp.onBeforeCellRender = function(args) {
  var events = dp.events.forRange(args.cell.start, args.cell.end);

  // check events array for event types....
  // ...
  
  // has events?
  var hasEvents = !events.isEmpty();
  if (hasEvents) {
    args.cell.cssClass = "has-events";
  }
};