Google Cardboard click event

I'm building a Google Cardboard game and don't understand how to interface with a "click" event. I'm trying to implement beacon-based movement, so the user should be able to look at a beacon object (at the moment, this is just a sphere), click on it, and move to the position of that beacon.

At the moment, my main camera has a GvrPointerPhysicsRaycaster and I have my GvrEventSystem with the pointer input module loaded as a component. I can add a "Pointer Down" event trigger to the beacon itself, but I want my main camera to recognize when a click as been made so that I can move to the beacon. How can I recognize that click?