On the second day, the Departure Ceremony is held here at the Saiku Heian-no-mori Park where a few Heian Period structures have been reconstructed. They had a large blue tarp on the ground for spectators.

Second day is the main event. There's the Departure Ceremony and Saio Gunko Procession. The Departure Ceremony reenacts the Saio's departure from Kyoto for her journey to Saiku Palace.
At 1 pm, the Departure Ceremony is held at Saiku Heian-no-mori Park where a few Heian-Period buildings have been reconstructed. At 2 pm, the 120 people dressed in Heian-Period costumes walk in a colorful procession called the "Saio Gunko" to an outdoor stage near the Saiku History Museum. The Saio princesses are carried in their own palanquins. It's a short walk.
On the outdoor stage, they hold a ceremony and picture-taking session from 2:45 pm. Everything ends by 3:30 pm. I went to see the festival on the second day on June 3, 2018. In the case of rain, the event will be canceled.
If you want to get close, you need to arrive earlier than the 1 pm starting time. Short walk from Saiku Station.