What is the recommended approach for performing non-interfering actions linked to the selection of an event in the calendar? Attaching a handler to the onClick event causes the console menu to the left of the event to no longer display. A common use case would be where a preview pane would be rendered at the side or bottom to display additional information about the selected event.

You can use onClick event , just be sure to return true from event handler , any other value returned from event will block default behavior.

… custom code …
return true;