Day 17 covers all of Chapter 12, Devadatta, and opens Chapter 13, Encouragement for Keeping this Sutra.

Having last month heard Medicine-King Bodhisattva-mahāsattva and Great-Eloquence Bodhisattva-mahāsattva, along with Arhats and Śrāvakas, vow to uphold the Lotus Sūtra, we hear the Buddha’s prediction for his aunt, Maha-Prajapati Bhikṣunī.

There were Maha-Prajapati Bhikṣunī, the sister of the mother of the Buddha, and six thousand bhikṣunīs, some of whom had something more to learn while others had nothing more to learn. They rose from their seats, joined their hands together with all their hearts, and looked up at the honorable face with unblenching eyes.

Thereupon the World-Honored One said to Gautamī:

“Why do you look at me so anxiously? You do not think that I assured you of your future attainment of Anuttara-samyak-saṃbodhi because I did not mention you by name, do you? Gautamī! I have already said that I assured all the Śrāvakas of their future attainment [of Anuttara-samyak-saṃbodhi]. Now you wish to know my assurance of your future attainment [of Anuttara-samyak-saṃbodhi]. You will become a great teacher of the Dharma under six billion and eight hundred thousand million Buddhas in the future. The six thousand bhikṣunīs, some of whom have something more to learn while others have nothing more to learn, also will become teachers of the Dharma. [By becoming a great teacher of the Dharma,] you will complete the Way of Bodhisattvas in the course of time, and become a Buddha called Gladly-Seen-By-All-Beings, the Tathāgata, the Deserver of Offerings, the Perfectly Enlightened One, the Man of Wisdom and Practice, the Well-Gone, the Knower of the World, the Unsurpassed Man, the Controller of Men, the Teacher of Gods and Men, the Buddha, the World-Honored One. Gautamī! That Gladly-Seen-By-All-Beings Buddha will assure the six thousand [bhikṣunīs, that is,] Bodhisattvas of their future attainment of Anuttara-samyak-saṃbodhi one after another.”

See Why Maha-Prajapati and Yaśodharā’s Predictions Came Last