Can you tell me about the group of devotees from Madras who visited Shirdi as mentioned in Chapter 29?

Certainly. Chapter 29 of the Sai Satcharitra speaks of a group of devotees from the Madras (now Chennai) region who came to Shirdi for Sai Baba's darshan. This group of travelers, who were part of the Ramdasi sect, had been engaged in devotional singing for a year. They were on a pilgrimage to Kashi and made a stop at Shirdi along the way, drawn by Baba's fame. The text mentions that they performed devotional singing with great enthusiasm at Shirdi. In a typical display of his unpredictable nature, as described in Chapter 29, Baba gave them eight rupees and eight annas, which pleased them, illustrating one of the many ways he interacted with his devotees.