The event bubble can be activated for calendar events using the following settings:
EventClickHandling="Bubble" BubbleID="DayPilotBubble1"
If you need to activate the bubble manually using JavaScript, you can do it by passing the "e" (DayPilot.Event) object to DayPilot.Bubble.showEvent() method:
EventClickHandling="JavaScript" EventClickJavaScript="openBubble(e)"
JavaScript
<script type="text/javascript"> function openBubble(e) { bubble.showEvent(e); } </script>
Where "bubble" is the value of DayPilotBubble.ClientObjectName.