Event Triggered by Moving Object into Boundary of Another Object

So I'm experimenting with an exploration-type activity in Captivate 9, where you have a character you can move around by clicking left/right/up/down buttons. What I want to have happen is that when the character is navigated to a certain location, an event occurs - audio plays, object becomes visible, etc. So I need the event to trigger by simply moving the character (object) into/over the boundary of another object. However, it seems that there is not a way to trigger an event in Captivate this way, at least not using its built-in functionality.

I can't trigger the event by having the playhead reach a certain point on the timeline, because the playhead doesn't move (well, except until a button pauses).

Any workarounds using only Captivate to achieve this goal? Or is this possible using Javascript?

Here is an example built in another e-learning software tool that shows a character interacting with objects in the way I'm trying to replicate:

http://www.richardleehill.com/heroland/http://www.richardleehill.com/heroland/

Thanks.