Could you tell me about the group of devotees from Madras who visited Sai Baba as mentioned in Chapter 29?

Certainly. Chapter 29 recounts the visit of a specific group of devotees from the Madras region, now known as Chennai. This group had gained fame for their devotional singing and had gathered at Shirdi to have Baba's darshan. They were on their way to a pilgrimage in Kashi when they stopped at Shirdi. The text identifies them as belonging to the Ramdasi sect and notes that they performed their devotional singing with great enthusiasm. As a sign of his pleasure and blessing, Sai Baba gave this particular group a sum of eight rupees and eight annas, which pleased their minds, as detailed in this chapter of the Sai Satcharitra.