Are there specific group activities recommended for Sai Baba's followers to connect with his teachings, and what materials should they use?

Yes, the texts highly recommend group activities centered around devotional reading. As detailed in Chapter 0, performing a Parayan or Saptah (a week-long reading) of a Guru's biography is a key practice. For followers of Sai Baba, the premier text for this purpose is the "Shri Sai Satcharita." This biography, authored by Annasaheb Dabholkar, is described as a recent, sweet, inspirational, and grace-filled work. It is considered one of the very few detailed poetic biographies suitable for these communal Parayans, allowing a "congregation of devotees" to collectively serve the Guru and strengthen their community.