This looks like a fun event! I see many activities have a cost, but there are some free ones and many are still relatively inexpensive. For the full schedule of events of the STORY! Festival, check out their link HERE.
We haven't experienced this one, but Sunday might be the day to go if you don't have a lot of time. They'll have a story teller at the North Park bandshell, and then the Carousel will be open with $1 rides. If you've never tried out this carousel, you really must! It's beautiful, but it's also one of the fastest carousels I've ever ridden.