Can you tell me about the group of devotees from Madras who came to see Sai Baba?

Certainly. Chapter 29 describes a group of devotees from the Madras region (now Chennai) who came to Shirdi for Sai Baba's darshan. Their fame for devotional singing had spread, and they made a stop at Shirdi while on a larger pilgrimage to Kashi. The text mentions that this group belonged to the Ramdasi sect and performed their devotional singing with great enthusiasm. During their stay, they experienced Baba's unpredictable nature; he gave them eight rupees and eight annas, which pleased them, but the chapter also notes his general manner could vary, sometimes giving sweets and sometimes sending people away empty-handed.