Eren left soon after giving his farewell speech to the audience.
He didn't stop Agatha and others from throwing a celebration in his honor for breaking into the Grandmaster Rank.
He believed that he didn't need to oppose all of Anfang's traditions. It was fine if others celebrated in his name. And it was fine to follow traditions just for the sake of following them.
After Eren left, the platform was taken over by the stage artists he had hired long back during his graduation ceremony. The play this time depicted Eren's struggles at the time of the Lazarus Project. It was his story but with some dramatic flair and exaggeration. Sort of twisting the truth and enlarging the drama for a theater-like experience.
The play was broadcast on various parts of Ravendale at the same time, enabling the people of the continent to get some insights into what actually happened that caused the Great Shattering.