Using events, arrays, and other tools from what you've learned thus far, try to build a kids image matching game. This is where you would see a grid of boxes, and when you click one, then you click another to see if you got a match. If you didn't get a match, then they turn over & you start again.
You must try do this all on your own, no downloading of someone's code, no posting questions to websites (unless they are specific questions about a certain JS item... don't ask "how do I make a kids matching game?").
Just give it your best effort, I'm not expecting a complete success here - just good effort. Don't spend more than 6 hours on this, unless you really want to.