It is Larissa who tells Jonas about the Celebration of Release for Roberto in The Giver.
"It was wonderful."
Roberto's life was discussed in detail prior to his Release. He had been an important man before becoming Old. He had been an instructor of Elevens, a member of the Planning Committee, and the landscape designer for the Central Plaza. He had raised two children as well. After the telling of his life, a toast was made, and the anthem was chanted. Roberto gave a good-bye speech, and others made farewell speeches to him.
"He was thrilled. You should have seen the look on his face when they let him go... Pure happiness, I'd call it."
Jonas had one important question for Larissa: He wondered where Roberto was sent when he was released, but Larissa did not know.