Can you tell me about the devotees from the Madras region mentioned in Chapter 29?

Certainly. Chapter 29 recounts that a group of devotees from the Madras region (now Chennai) came to Shirdi for Sai Baba's darshan. These devotees were on a larger pilgrimage to Kashi and made a stop at Shirdi along the way. They had heard of Baba's fame as a great saint who was patient, generous, self-controlled, and compassionate to pilgrims. The text notes that this group had spent the previous year engaged in devotional singing. Their visit is one of the initial events described in Chapter 29 to set the stage for discussing Baba's charitable nature.