Rivers of Light Summer Show Time?

Our plans are for June 2020. In my touring plans, I added ‘Rivers of Light’ - but I’m getting a message saying ‘After Dark Experiences Not Available.’ The plan lists park hours as 9am - 8:30pm. When I add ‘Rivers of Light’ it lists showtime as 9pm. Does that mean that ‘Rivers of Light’ does not take place during the summer? Why does the touring plan allow me to add an attraction that is scheduled after park closing?